It needs to come out as it will start rotting, it'll release ammonia and that really wont be good for the fish. As for his reaction to tank maintenance... ignore him. The only way fish learn tank maintenance is 'safe' and not a giant fish come to eat them is by you just getting on with it. Mine (once I've had them a few months or so), tend to get the message and although they swim around my hands and gravel vac etc, they aren't skittish... they just ignore me.
Any chance of that pic yet? You can upload on photobucket or imageshack, then you just need to post the url of the picture here.
There is also aquarist-classifieds.co.uk which you could have a look at for second hand tanks. Where abouts in Surrey are you based? We could help you look for one if you wanted?
Ooo give this a gander... http
/cgi.ebay.co.uk/trigon-190-corner-tank-/230573421153?pt=UK_Pet_Supplies_Fish&hash=item35af3f3261