In case it is of interest to anyone else sat on a pile of scrap that is awaiting a round tuit, I got round to taking the old bits of heating system to the scrap yard today.
Copper cylinder (indirect, prolly about 950x450) got £40
8kg of pipe offcuts etc they took as copper and that made £28.50 5kg of braziery made £17 and 3kg of brass got £7.50On the Fe side of the yard, 160kg of old boiler[1] and a couple of rads got another £17.60
(was quite surprised that much of the stuff I had classed as braziery (i.e. offcuts with soldered fittings, or with backnuts and olives still on), they actually classed as copper, and much of the stuff in my brass bucket they took as braziery - still, not complaining ;-) )
[1] Its gas valve made £39 on ebay, the programmer £39, and the prog stat £16