We ditched the storage heaters and THTC about 7 years ago. Went to economy 10, electric radiators with 24 hours timers and individual thermostats. Installed an unvented hot water cylinder with a time clock to take advantage of economy 10. We ran a two bedroom house mostly on the 10 hour cheap rate covering all electricity (heating, shower, hot water, lights, washing machine etc) for £50 per month.