Get a Roadlok, and stay in half decent hotels.
This is my solution. I'm hoping that as a result, if my bike is nicked it will by a gentleman thief, not a run-of-the-mill scrote and as such I will feel less aggrieved...
And if it does get nicked, you can have a day in the spa, while you book your flights home!
Is it more likely to get nicked abroad than back in Blighty??
I'd have thought the big risk is at home. Surely the chances of a scrote happening to see your bike and get his shit organised whilst your over-nighting in a foreign hotel are considerably lower than somebody clocking your bike at home and planning a lift at their leisure.
anecdotally, most people I have known to have bikes stolen have had them taken from home or workplace by organised gangs probably stealing to order. As you imply, they will do their research to know when the bike will be in a particular location unattended and will have suitable equipment to defeat security whilst causing the minimum of fuss.
You need one of these http://www.ibabodyguards.com/
A D-Lock will fit under the pillion seat and won't take up space in your panniers so definitely worth taking.