Your bills seem very high; it would be worth checking that you are receiving the correct bill; I received my neighbours bill for about 18 months before I realized - check the codes on your account /cross check with your meter; ckeck the usual things - leaving electrical equipment on/ useage / central heating timers etc

We live in a new 4 bed - and currently pay £34 for electric and £56 for gas (3 people in the house) - hope this helps to make a comparison. Have you been paying regular amounts before January