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Doesn't look to me like you've got the headroom.
Measure from the top of the ceiling joist to the bottom of the ridge beam. You want at least 2.4m to allow for various bits of insulation, flooring, any necessary structural bits of metal that have to go in. Any less than that and your finished ceiling height will be too low.
If you do have the height best advice is do it properly. Build a big square box dormer out the back and add really good useful space. You can do a simple conversion of what's there for about £20k down south, probably less up your way, but it will be small and awkward and you'll have to bring the stairs up in the middle to get head height. The big dormer will add maybe £10k to the cost but will be eleventy billion times better and will add value to the house, where a half-arsed job often harms the value as you lose as much first floor space putting the stairs in as you gain on the second floor.
Does anyone have any experience with having a loft converted? My loft isn't huge but could definitely be made into a useful space as a small bedroom or office type thing. I'd mostly be interested in how much value it would actually add to the house in relation to how much it would cost.
This is my house by the way.
http://www.rightmove.co.uk/property-for-sale/property-35264607.html