If you want to leave them on all year, go for Goodyear Vector 4 Seasons, Bridgestone A001s or Vredestein Quatracs as these perform as well as cold weather tyres in the winter yet wear well and perform well in the summer.

Go for a higher speed and load rating to make sure you are covered. No need to tell your insurer about swapping the tyres alone; only if you change wheel and tyres size in order to do so.