Heard of this happening before- better not spread. I think the same as you do on taste. If it is the non cask beer they slipped in, (had THAT before, as well), then all I say is what a con. If it happens in my local SS pubs, then I am done with it, for good. This, to me, is ruination of a very fine beer indeed, IMHO. Cask was taken out of my nearest SS pub a few years ago, now the pub has been refurbed, it has come back. Previously manager told me I was daft if I didn't loke sov, or the (bright?) version of OBB. Heard it last week in the Tivoli @ Morecambe too! (no cask there either- refurb pending!!). Manger however, was not the one to say it, 'twas another customer. Manger was a very likeable person and knew her onions!