I should add that the 1m square would have been £180. Maths eh.We just paid around £100 for 500mm square of 0.9
Copper tanks are very thin, way less than 1mm.hmm... at that sort of money i need to work out how to reliably flatten old copper tanks!
(years ago i had a project that required the copper coil from the insides of indirect tanks - i acquired quite a few of them and just used to scrap the shells!)