I think Slazenger contract Duncan Fearnley to make their Classic range of bats, like the V12, V6 and V5. I think the V6 used to be made in India, and I'm not entirely sure on the V5s, but last I read about it, they are all made in England now. The other bats are made in India, I believe by FC Sondhi, but I cannot be 100% sure, as I've heard that from other people. Regardless of where they are made, I found that Slazengers were quite good when I tried one or two of them a couple of years ago, and that's all that matters.

A sponsor like Uzi or Vitas could give you more details on them, as they stock the bats themselves.