The trouble with "converting" licences is that it's often at the schools or the instructors discretion how much training you need. Every instructor/school/country wants things done THEIR way.
The local area will be different, the radio calls will definitely be different, the maneuvers will be taught in a different way. Also some schools in the UK had an VERY anti-FAA/foreign licence attitude and if you turn up with your licence and saying "LASORS says I only need 'training as necessary' and the skills test" the school often thinks "we'll show this guy that things are done different here", and you're in for 10 hours flying at £300 per hour. That's wiped out any savings you made going abroad to begin with.
Speaking as a person who has converted a CPL, FI, AND a IR from the FAA system to JAA, I can say it ALWAYS takes more time than you think.
My advice, when heading abroad for training, do thorough research and add 30%-40% onto any "converting costs" you have budgeted for.
Don't say I didn't warn you...