Claire & Phil
The only real option for you is probably a personal loan or 2, unless someone knows who will give you a mortgage on a foreign property.
HOWEVER think LONG & HARD before you do this. Your circumstances may change suddenly, you might get made redundant, you might get notice on your present property & have to look for a mortgage for a property here.
When I said think hard - I'm speaking from personal experience. We took out a short term personal loan for part of our Calis outlay just until we sold a property here. The property was eminantly sellable in a very sought after area BUT (long story) it ended up we had to fund this for not the 6 months maximum we expected & had budgeted for but for over 2 years. THINK HARD!