Weight varies, depending on year and spec. The oldest ones are the lightest and get heavier with each new variation, 2008-to early 2009 being the heaviest hardtop (roadsters are the heaviest). Jap import ones might be marginally lighter again as spec'ing is different again.
Lol, could tell you exactly the weights of the ones in NZ, but then I think UK ones have a tiny bit more weight with the different spec. 1467kgs, for my 2004 NZ Touring spec. Not much use though.