Sure. well, they can do that, surely, no?
1) They do it for the many US centric channels!
2) BBC iPlayer is available on other set top boxes so i don't think it's a BBC side issue.
3) Just like with the (UK version of) iPlayer on the iPad and iPhone too - It's available on the UK store only. Sure some people will use VPN and set up a UK account, but I can't see why Apple can't give the BBC a space for UK registered accounts.
I suspect it's more to do with the...