shylock:I am unable to give usage figures for my current home because I only use electricity with a key meter.
If you don't know your current usage just answer "don't know". Typical usage will be entered and you will get a list of suppliers in price order. The annual cost won't be accurate but the supplier order will be accurate for the "typical" data entered.
Pay close attention to the tariff details box for any restrictions applicable to the tariff.