Law / Polish car insurance and how it compares to England [29]

I'm thinking of just renting a room in Krakow, and then insuring a Polish vehicle etc to that address, whilst living in the uk (I'm a UK citizen). What do you guys think? Would I be ok with the Police in the UK if I got pulled, provided the car was legal in Poland, and I took it across back to Poland every six months? Believe me or not, the car price, insurance, room rental etc works out at more than a tenth of what I'd pay to buy the car and insure it in England (I'm nineteen with 0 no claims wanting to buy a mazda mx-5) :/