Household utility costs

[mtbc]

Having worked out this morning I plan to take a shower and got to wondering how much they cost. Off-hand I don't know what we pay for natural gas but it's probably around £10 per week on average; my daily showers must be at least part of that. I can get a gym membership at work for comfortably under £4 per week and use their hot water instead. If I lived in England thus had to pay for my water usage too I wonder if that would be enough to move me to exercising at work.