Jobs In Europe

[Falcon]

I was wondering if anyone knows how hard it is for a U.S. Pilot to get on with a British Airline. I just saw on www.bizjetjobs.com that Astraeus Airlines is seeking B737 and B757 Pilots. I have the experience that meets the demands but I am from the U.S. Is it a big deal to upgrade my licenses to JAR requirements?

Thanks in the advance for the help.