So off we went, purchased the materials (not cheap but best value around) and started the work. The space when cleared in the back yard was bigger than I perceived and to be honest it was a bit of a challenge to resurrect the timber foundation between rain showers and also with minimal noise to neighbours as we live in a terraced echo chamber.
Anyway more or less done .. minus a few steps and it's rained since. Not to worry there's years to be had on this deck yet and I can't wait to sit on it on a warm day with a cup of tea and a good book.