MyQul
Chairman of the Bored
I don't believe this. A fourth brew now seems to have the same issue. This one is a John Bull Traditional English Ale kit. I was planning on leaving it a while yet but I had to know and, whilst not as bad because it's younger than the others, that same familiar aftertaste is definitely there.
Obviously you want to pin down what is causing the problem but you might also be able to save this brew. You could try campden tablets. I've never used them myself before but I think I'm going to chuck a couple in my mild to try to nuke the colony of mold I have floating on the top