Electric Cost

Been in my new flat for two months. Just got my first electricity bill. Uh, wow. Would anyone be willing to share the cost of their bill with me? I'm with OVO. A quick description of your housing situation and a pound amount would be wondering. I live in a flat that's approx. 5 meters x 10 meters, but I have two very large and drafty windows (probably 1 meter x 3 meters). There's 4 heating units in my flat, which are set at 23 degrees. I am flabbergasted by the cost of energy here. Jeez.

Edit: With OVO, I pay a bit over 27p/kwh. My bill last month is over 320 pounds. This is my first two months in the country, so this bill is just wow.

Second Edit: Since someone mentioned it below, I have an electric water heater with two switches that I leave on all the time. Is that not how it works?