I shall ignore the preceding few posts, but for your post I did the sums from the Trangia webshop: so a boxed Storm Cooker 27-1 UL is €69 (£61.5411 GBP) from the webshop but in UK can be had for £44.99) and building the same set from spares (again ignoring postage) came to €92.30 i.e. 23.30 euro extra or 33% extra cost.... if you want one outer HA or duossal pot in a such a custom set from spares that comes . As for the pick and mix boxset idea, I though my pick and mix boxset idea might make factory life simpler and that would be better for a family firm who wished to reduce stress? The number of T25/27 boxed set variants has rather mushroomed recently hence my wondering.... But as the original post was a simple question about HA process cost out of curiosity, and no one seems no know the answer, I think would prefer the thread was deleted or locked.