Hmm.... it's tricky... the same is gonna happen to me, my parents are already looking into properties in France and just need to sell there house... i'm going to be a first year at uni this coming year!!! It's selfish of them, but they can't just hang around for you (or indeed in my case for me, my sister and brother!!) as you are an adult and could find a place to live yourself if need be. Obviously the right opportunity has come up for them and they figure you no longer 'need' them.
I do see why you're annoyed.. i am slightly miffed as well, but hey i'd like to think if it were me and my child had gone off to uni and turned into an adult they would be looking for their own place ASAP rather than coming back home again.
There is the issue of finding somewhere to live though, which clearly is a problem as you have more to worry about right now 9ie your degree), but if i were you i'd talk to my parents and say Hey, where will i live when you go... would you be able to look into some possibilities for me as i really don't have any time to sort this out.
Lol you never know you could make them feel guilty and they may offer you the house in the UK on a part time basis until you find somewhere more permanent... or failing that may have already considered you and are planning on paying for somewhere for you to live?!