At last, I know what I have! I cut a peice off and took it to my local electrical shop where they confirmed it is 6mm2. I Also met a sparkey there, (well its a good place to) and he (after doing that thing where they suck air throught their teeth) said it would cost about £200 to rewire it to a 10mm2 and I would be better off getting a smaller shower...... which I did, and its all up and running and working. (still cant shower though coz I got me tilin to do!!!)
Thanks for your help.
PJ
yes but 6/4 also exists (6/6 does too i belive), indeed from some comments i've heared in the past i belive it may have been more common in the past (this may be why old 6mm T&E is chunkier)
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