Simon, I took advantage of the Sherry Cask at £20 and now have 7 bottles stacked up in my kitchen. It's now £28:25 on Amazon & £30 at Asda.
Regards Theakston's O/P, I adore the stuff, but not out of a tin. I remember having it the first time at a Sheffield beer festival (along with Tim Taylor's Landlord) and was blown away. That would have been circa 1981.