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In May, Gordon Brown promised us five eco-towns if he became prime minister. Five months later, duly crowned, he doubled the number to 10. So he鈥檚 excited by the idea, but what exactly has he got us into? What is an eco-town, anyway? How does it differ from the bog standard towns we are all familiar with? And is there a hidden political agenda?

In trying to grapple with these issues, the place to start is the Eco-town Prospectus, published by the communities department in July 2007. The front cover has a photograph of the very striking Chase Tower apartment block, which is part of the Newhall development in Harlow, Essex. It鈥檚 an interesting place to visit 鈥� and photograph 鈥� but it hardly rates as an eco-town - more a cutting-edge housing estate.

What other examples does the prospectus look at? There is quite a lot about the yet-to-be-built Northstowe, a new town already under construction near Cambridge. Gordon Brown referred to it when he first mentioned the eco-town idea back in May and everyone thought it would become the first one. But now the mandarins seem to have back-pedalled and will say only that they want Northstowe to be 鈥渁n exemplar鈥�. Cranbrook in Devon seems to be in a similar boat: as it鈥檚 already on the drawing board, it is not eligible for eco-town status.

The prospectus looks across to Europe for examples of best practice, and features well-known and much visited schemes such as Vauban near Freiburg, Germany (5,000 homes), and Hammarby Sj枚stad, near Stockholm (10,000 homes).

The only British town that it mentions is Letchworth, the original garden city, which is more than a 100 years old. What are we meant to make of that? That despite a century of building new towns, we have learned nothing? Just like football, we invented the game and now Johnny Foreigner is showing us how to play it.

The only British town that it mentions is Letchworth, the original garden city, which is more than a 100 years old. despite a century of building new towns, have we learned nothing?

It is interesting to note that part of Ebenezer Howard鈥檚 design brief for Letchworth was to provide 鈥渨ell-designed houses with gardens set on tree-lined avenues, clean and healthy work places and a pleasant and healthy environment in which to live, work and follow leisure pursuits.鈥� Contrast that with the description in the communities department鈥檚 prospectus: 鈥淓co-towns should promote healthy and sustainable environments through design and planning to deliver physical and mental health benefits.鈥� What has changed? Swap the gardens for a roof-full of photovoltaics and you have eco-Letchworth.

Howard famously banned pubs from Letchworth, hoping the denizens of his model town would get their kicks from lemonade, gardening and cycling instead. Could it be that our new eco-towns will extend their brief in a similar manner, thus neatly addressing the problems of binge drinking and obesity?

The requirements for eco-town status push every button that can be pressed. They will be zero-carbon, water-efficient, flood-managed and biodiverse.

Eco-towns will be masterplanned to the nth degree. Of the housing, between 30 and 50% will be affordable, car use will be discouraged and public transport will be of the highest quality. There will be local jobs for local people, together with good schools and health centres. Everything will have been thought through, so lives can be lived sustainably from cradle to grave.

But, as worthy as these aims sound, in reality they are not that different to how all new communities are planned. The zero-carbon status may sound new and challenging, but the Code for Sustainable Homes is intimating that new houses will have to meet this standard by 2016. This hardly makes the eco-towns exceptional.

The cynical will be wondering if the whole idea is to place a large number of natural Labour supporters in the Tory
shires: gerrymandering on a grand scale

So why bring forward this eco-town proposal at all. And why now? Well there is one essential requirement that stands out as being a little different. It鈥檚 the very first one on the list, and it states:

鈥淓co-towns must be new settlements 鈥� separate and distinct from existing towns but well linked to them.鈥� Why throw that into the mix? What is remotely eco about it? In terms of transportation, building away from existing urban centres is very bad news. It requires much more infrastructure and adds to travel and commuting times. Why abandon the policy thrusts towards urban extensions and regenerating brownfield?

It could be that policy-makers are under pressure to once again to open up the green belt because many of the best brownfield sites have been developed. Maybe Brown is hoping that everyone will be so excited at the prospect of having an eco-town nearby that they will drop their guard and allow previously sacrosanct land to be developed.

The even more cynical will be wondering if the whole idea is to place a large number of natural Labour supporters in the Tory shires: gerrymandering on a grand scale. No doubt the local parties will be watching with interest when the sites begin to be selected next year.

The reality is likely to be more mundane. We鈥檝e had exemplar housing initiatives before, most notably the millennium villages, which arrived with a great fanfare of publicity but soon got sidetracked by a lack of enthusiasm, not to mention interminable planning disputes. The eco-town proposal is likely to follow a similar pattern when the difficulty of finding suitable sites emerges. My bet is that we鈥檒l end up with, at most, two eco-towns before the whole idea gets quietly forgotten.