Porsche, Bozza and Paddick

The curious alliance between the Tory and Lib Dem candidates and the maker of some rather polluting

It was always going to cause a stir. The new emissions-based Congestion Charge (the 'CO2 Charge') was confirmed by Ken Livingstone at a press conference at City Hall last week. I was there to witness him signing the order to bring in the new scheme, which means that, from 27 October, the most polluting band G cars (emitting more than 225 grams of carbon dioxide per kilometre) will pay £25 per day to come into the central London C-Charge zone. Meanwhile, the cleanest cars in bands A and B (less than 120 g/km) will get a 100% discount, at least for a while.

Acknowledging the part my campaign group the Alliance Against Urban 4x4s played in delivering public support for this measure, Ken Livingstone tried to hand me the pen used to sign the order as a souvenir. Unfortunately, the pen in question turned out to be a birthday present belonging to a member of GLA staff, so I wasn't after all able to place it in our campaign museum (along with our first spoof parking ticket and our collage of sweary emails from petrolheads) but it was a nice gesture.

Despite the long-overdue need for real financial incentives for cleaner cars, it is election time, so the announcement immediately prompted knee-jerk attacks from the other Mayoral candidates. Not only that, but gas-guzzler manufacturer Porsche has since threatened a legal challenge and both candidates have used this as an excuse to criticise the scheme again. Boris Johnson said he “understood where Porsche was coming from", while Brian Paddick added, "Porsche have a point."

I'm not worried by the legal threat at all. I don't see how a classic case of applying the 'polluter pays' principle could be classed as discrimination, especially since Porsche could easily make vehicles under 225 g/km but simply choose not to. And people will still be free to carry on driving big, polluting cars in central London; all the new charge means is that they will have to pay more for the extra cost of the pollution that they create. It all seems perfectly fair to me.

Legal experts agree that Porsche's threat is unlikely to come to much in the end. Barrister Nick Armstrong told the Guardian that 'unfairness' to Porsche owners was unlikely to wash with the High Court, saying, "On the face of it is difficult to see how Livingstone's decision falls outside the range of reasonable responses."

Reading through the newspapers on this, it's sometimes hard to tell the complainers from the proponents of the scheme. While the head of Porsche UK (against) is actually complaining when he says that the new charge is, "a green tax for those who own certain cars in London,” Ken Livingstone (in favour) is all for it when he says it would, “ensure that those who choose to carry on driving the most polluting vehicles help pay for the environmental damage they cause.”

Similarly, while Tony Juniper of Friends of the Earth (in favour) says, “It would be more appropriate for Porsche to put its effort into making a new generation of much less polluting vehicles,” Brian Paddick (against) says much the same with, “Manufacturers are already modifying their cars to come in just under the CO2 threshold.” Yes Brian, that's the very idea and, if they do, it will represent a real advance. The difference between the 348 g/km of CO2 chucked into the atmosphere by the Porsche Cayenne and the 225 g/km that would bring it under the threshold is significant, even if 225g/km is still too high for a truly sensible car.

I find Paddick's strident opposition to this measure the most bizarre development here. After all, while on the London Assembly, one of the earliest proponents of this measure was Lib Dem MP Lynne Featherstone. In fact, a lot of his policy-making is starting to develop a back-of-an-envelope feel, especially on green issues. His campaign has come up with a long, rambling list of alternative ways of cleaning up London's cars including (weirdly) off-setting schemes and a self-defeatingly large £10 congestion charge zone extending right up to the M25.

What's not in doubt is that this is definitely an election issue so, if some people don't like the idea, they can of course vote for one of its opponents in May, rather than for me or Ken Livingstone.

Having argued for these changes for four years with the Alliance Against Urban 4x4s, and having looked into almost every detail of the Congestion Charge for our report to TfL in 2006, I am very happy with the resulting scheme. My one quibble is that, at the bottom end, there is no confirmed date for when the zero-charge band will be tightened. That's why, in my response to the recent consultation, I proposed making it clear now how the emission bands at both the top and bottom ends would be strengthened over time.

However, while I am being constructive, both Johnson and Paddick aren't helping themselves or their campaigns with their attacks. When you find yourself arguing on the side of a petulant car company against the interests of ordinary Londoners, you should realise you've taken opposition for opposition's sake too far.

Sian Berry lives in Kentish Town and was previously a principal speaker and campaigns co-ordinator for the Green Party. She was also their London mayoral candidate in 2008. She works as a writer and is a founder of the Alliance Against Urban 4x4s
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I believe only Yvette Cooper has the breadth of support to beat Jeremy Corbyn

All the recent polling suggests Andy Burnham is losing more votes than anyone else to Jeremy Corbyn, says Diana Johnson MP.

Tom Blenkinsop MP on the New Statesman website today says he is giving his second preference to Andy Burnham as he thinks that Andy has the best chance of beating Jeremy.

This is on the basis that if Yvette goes out first all her second preferences will swing behind Andy, whereas if Andy goes out first then his second preferences, due to the broad alliance he has created behind his campaign, will all or largely switch to the other male candidate, Jeremy.

Let's take a deep breath and try and think through what will be the effect of preferential voting in the Labour leadership.

First of all, it is very difficult to know how second preferences will switch. From my telephone canvassing there is some rather interesting voting going on, but I don't accept that Tom’s analysis is correct. I have certainly picked up growing support for Yvette in recent weeks.

In fact you can argue the reverse of Tom’s analysis is true – Andy has moved further away from the centre and, as a result, his pitch to those like Tom who are supporting Liz first is now narrower. As a result, Yvette is more likely to pick up those second preferences.

Stats from the Yvette For Labour team show Yvette picking up the majority of second preferences from all candidates – from the Progress wing supporting Liz to the softer left fans of Jeremy – and Andy's supporters too. Their figures show many undecideds opting for Yvette as their first preference, as well as others choosing to switch their first preference to Yvette from one of the other candidates. It's for this reason I still believe only Yvette has the breadth of support to beat Jeremy and then to go on to win in 2020.

It's interesting that Andy has not been willing to make it clear that second preferences should go to Yvette or Liz. Yvette has been very clear that she would encourage second preferences to be for Andy or Liz.

Having watched Andy on Sky's Murnaghan show this morning, he categorically states that Labour will not get beyond first base with the electorate at a general election if we are not economically credible and that fundamentally Jeremy's economic plans do not add up. So, I am unsure why Andy is so unwilling to be clear on second preferences.

All the recent polling suggests Andy is losing more votes than anyone else to Jeremy. He trails fourth in London – where a huge proportion of our electorate is based.

So I would urge Tom to reflect more widely on who is best placed to provide the strongest opposition to the Tories, appeal to the widest group of voters and reach out to the communities we need to win back. I believe that this has to be Yvette.

The Newsnight focus group a few days ago showed that Yvette is best placed to win back those former Labour voters we will need in 2020.

Labour will pay a massive price if we ignore this.

Diana Johnson is the Labour MP for Hull North.