Twizzle

With the current problems in both France and UK, I was wondering wether the option of "House Swaps", is becoming more common. I know there is a huge market for holiday swaps, but what if you are desperate to get back to uk and cant sell your house? Is there a way to contact someone in UK (or elsewhere) who may be just as desperate to get to France and cant sell their house. If the properties are roughly the same price. would there be huge legal problems?