Developers desperate to win one of Gordon Brown鈥檚 10 eco-towns are offering planning consultancies up to 拢500,000 in no-win, no-fee deals.

At least one of the 15 bidders included on the shortlist, unveiled last Thursday, has made this offer and others are prepared to spend 鈥渉undreds of thousands of pounds to secure planning permission鈥, according to one source.

The hope is that the lavish sums, which will be spent on architects鈥 fees, sustainability consultancy and legal work, will secure a place in the programme once the 15 is cut to 10 later this year.

A member of the bid team that has made the 拢500,000 deal with an unnamed planning consultancy, said: 鈥淭he cash is a real incentive for them. But we pay nothing if we don鈥檛 end up as one of the final choices despite the work that 鈥榮 gone into it by the consultancy, and that鈥檚 an even bigger incentive.鈥

The minimum amount of houses to be built for each scheme is 5,000 and the 15 shortlisted bidders were selected from 57 entries. The three largest bids have come from O&H Properties in Bedfordshire (22,000 homes across two sites), Rossington Ecotown Partnership in Yorkshire (15,000 homes) and Pennbury in Leicestershire (12,000-15,000 homes).

The government has set up a panel of experts to advise shortlisted developers on their bids during a three-month consultation process that began last week.