To make yourself useful to corporate aviation you'll be wanting to get a good range of experience in GA. The US is a good opportunity to do this. Find an FBO that has a few bizjets. Talk to them, find out what they want. Make yourself useful and while doing that, build up your multi time.
This will help over in the UK as well. Many bizjet opportunities come about by you being "johnny on the spot" at the FBO and the boss liking the look of you. If you've done more than the bare minimum and seen to be keen then you might get a go.
Unfortunately for you, companies like Netjets want a min of 1500 hours (and JAA ATPL) to get a lookin in Europe.