Well, I et 'em. The only slightly poisonous bolete seems to be B.satanas, and even that isn't when picked young and cooked properly. I did enough research to allay any fears, and settled on the Birch Bolete as my ident. Still not 100%, but not too worried with this type of polypore.
Although mushroomy they weren't as tasty as ceps, perhaps even a little tasteless and boring, although they were mixed with supermarket closed cups aswell. No problems at all, not so much as a fart out of place!
Thanks for your input, it's handy to have as many sources of info as possible when identifying fungus for eating.