I must have just bought an average UK home then

+/- £500

But mine came with a 4mx4m stone & breeze block Summer house (actually it have been an electricians workshop) now lined with insulation and to be a decent sized darkroom.
What you get for £186,500 in the UK depends very heavily on the area. Mobberly which is near Knutsford is in a very affluent belt that stretches from the South West to the South East around Manchester, It's known as Footballers wives territory because so many leading football players live in the area, including (in the past) David Beckham who lived to the West at Aldderley Edge for a few years.
Manchester has two major football teams City and United, Liverpool is nearby and has Everton & as well as Liverpool FC itself, Burnley is to the north, Stoke City to the south, a large proportion of the current and former players live in that belt below Manchester, and it's a very sort after area, unlike the North East of Manchester. And then Manchester itself is one of the nicer British cities great shops, very friendly and vibrant. (Maybe I'm biased as my mothers family came from the area).
So I'd guess there would be no difficulty selling houses on the proposed development.
Ian