Thanks! Really useful answers. I'm not excessively worried about the wind thing becasue (famous last words!) the space where it would go is sheltered on three sides by my house/wall/shed and further sheltered in that the surrounding houses form a block pattern. The awkwardness of assembly on some models sounds a pain though!

I'm looking at ebay and local ads, even Freecycle, so I'm hoping I won't have to pay full price. The advice above will help me avoid getting a complete dud instead of a bargain

Claire