Thanks for all your help with this guys, I have had a quote from a friend of a friend who is an architect, he said £700 cash for him to draw up plans and submit them, does this sound about right?
Thanks
John
£700 sounds about right for planning drawings for a simple single storey extension, they aren't doing you a massive favour for cash. I would still get some other fee quotes and arrange a couple of free initial consultation visits then you could ask them their opinion on you options for the extension. Probably for £750 - £800 you would get a professional architectural designer with all relevant insurance and come back if they make a mistake rather than a dodgy cash in hand merchant.