In the meantime I came across 'Sweet Home 3D' , easy to install and I've knocked up a quick sketch of my bungalow and first draft of a possible extension in an hour or so.
I used Sweet Home 3D (which is free) - it is an interior design tool, so no good for roofs etc. but helped me plan and design my extension.
What is handy is you can upload a house plan - I had the estate agent one. Then draw over this.
This is the plan I made. It was really useful being an interior design tool as I placed all existing furniture with correct sizes to help decide size of rooms - if it wasn't for this I would not have had a place for our corner cabinet!
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