SD: I was somewhat hesitant with regards to mentioning the FAA IR but having done it and a UK IMC (long story) I would second that doing an IR in the LA basin area is more intense than most things here in dear old blighty. The 'experience' factor is heavily weighted in favour of the US and I find that most of the UK flying is not necessarily as burdensome as people say. Nevertheless all flying, anytime and any place requires your full attention.
Kangy: Once again well done on gaining your IMC and good luck on your IR.