Absolutely agree about using brownfield sites for building, although I wish more was done to put infrastructure in place before the numbers of homes was increased. My local authority is building on any spare piece of grass at the moment, and giving permission for cramming in high rise blocks by greedy developers. Not one extra school place, no extra doctors, hospitals etc and there's even been a reduction of our train services. The last straw was when they demolished a children's playground for more new building.
On the subject of Chelsea, I have loved my visits although I have never managed to see it all, it's so big. Of course it's artificial in that all those plants being at their peak at the same time won't happen in 'our' gardens, but they are inspirational. I usually love Chris Beardshaw's garden, he does 'proper' gardens as far as I'm concerned. I haven't had a chance to look at any of this year's offerings yet.