Have recently been browsing this site, looking for a smallish Fargesia clumping bamboo - American, but lots of good info on choosing, planting and caring for bamboo... http://bamboogarden.com/Hardy%20clumping.htm
They say you can trim the tops to reduce height when you do your annual thinning (always cutting the cane above a node) but I think this might look a bit odd and spoil the natural shape. At least until it grows again. You may be better choosing one that doesn’t exceed your desired height...
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
They say you can trim the tops to reduce height when you do your annual thinning (always cutting the cane above a node) but I think this might look a bit odd and spoil the natural shape. At least until it grows again. You may be better choosing one that doesn’t exceed your desired height...