Susie, I loved SIL the first time I saw it. I wasn't as thrilled with it the second time, but maybe because I'd built it up too much in my memory. It was cute and fun and clever, though.
As for TEP ... well, here again, it was a reaction to hype. I probably would have liked it OK on its own, but it got SOOO overpraised.
Usually I like British things! (In fact, OT but I'm often amazed -- how can so much great classic enduring literature, not to mention film and music, have come out of one medium-sized country?)