Thank you for all your help with this, and for all the patient emails while I decided exactly which size and layout of studio I wanted. I have moved all my stuff into it now and started painting in my new studio yesterday. It's really great to have the space and all the windows with the garden around me while I work. It looks really good from the house as well and doesn't look too obtrusive, despite the size in a relatively small garden.
I'm very grateful for your help throughout.
All the best.
Thank you again