Hi Jo Many thanks for your comments. Looked at your website - really lovely work. Love your drawing style as well. What method do you use to colour render your plans?
As for the paint - I did see Grand Designs when they used the special one but haven't used it myself yet. It is something I want to look into further especially for white rendered walls. The only company I've found so far is http://www.neverpaintagain.co.uk/ but their colour range is a little limited.