This is what I'm doing at the moment, bringing car over in the spring, taking it back October and getting MOT again before I drive back to Hungary, BUT I hit problems with my UK breakdown cover. Britannia who I have been with for 20 years will not cover me for more than 180 days a year out of UK. It cost me an extra £80 to change breakdown company to Green Flag who don't have a 'time abroad' rule. + watch out for the 16 year rule if you have an old car.