Honda too, in its recent mid-term review, announced that it plans to roll out a fuel cell vehicle in Japan, the U.S. and Europe by 2015.

FORBES: Toyota Rides Hybrid Sales To $91 But Competition Is In Overdrive

One message that David Cameron and Nick Clegg supposedly want to get across with their mid-term review is that the coalition is about more than the economy.

BBC: An economic mid-term review

Nick Clegg last month promised the government would publish a "candid" audit of the government's performance as part of a Mid-Term Review "which would surprise on the upside".

BBC: UK Politics

But the prime minister dismissed this, saying the government was publishing "every single audit of every single promise - all 399 pledges set out in the Mid-Term Review".

BBC: UK Politics

The BBC's chief political correspondent Norman Smith said there were growing signs that a commitment to a cap could be included in the coalition's mid-term review expected to be published shortly.

BBC: 'Target winter fuel benefit to pay for elderly care'

Hence, the higher cap, which was briefed to journalists as part of the release of the coalition's mid-term review earlier this week and is likely to be fleshed out in more detail within the next month.

BBC: Social care: The ?75,000 question

As the government approaches its mid-term review, director general of the business group CBI scored the coalition eight out of 10 for its plan for the economy, but just five out of 10 for delivery of the plan.

BBC: David Cameron: Cheap borrowing the priority

Speaking at the launch of the coalition's mid-term review, Mr Clegg said it was not helpful to "portray" proposed changes to the welfare system as pitting "the deserving poor against the undeserving poor and the in-work against the out-of-work".

BBC: Sarah Teather

Movement on childcare had been expected for inclusion in the government's mid-term review - the document of fresh policy ideas being published by the coalition partners next month - but many inside government now expect the publication of the mid-term review to slip back.

BBC: Ministers 'plan childcare change'