It's an absolute bugger getting bits and service for Bob's kit in the UK! I own two Alias's, and LOVE them - indeed when I have some wedge, I may well be investing in some more. Take a look for the intimidator owners group, which is a very useful resource for bob fans in the UK.
Not sure about customs issues with markers, but I'm sure it's been talked about before- have a look through the forum and something might already be here.