The tank cost £76 of the Queens paper money plus postage from Germany.
It is difficult to estimate actual costs. So far, including the bike purchase, I have spent around £500. I would guess that I am looking to spend another £1500 but that will include new wheel rims and spokes, a little paint, bits and a bore/crank for a complete engine rebuild and some spares. I would guess to just get it road legal and running, it would cost around £500. The benefit you have is that there is an abundance of classic parts of all marques in the States and it seems easier buying from there if you are Canada based. It is often beneficial to but from there if you are in the UK. Just remember the import tax rules. Canada have a lot of parts too but the international postage is huge and therefore is not a cost effective option most of the time. I do have some bits coming from Canada, USA and some small pattern parts from Thailand at the moment.