I try for the first time to switch electricity supplier and the new one told that they could not do it because of the 2 MPANs. I call the SP and asked them for a better deal and stay with them. However, do we have other choices?
@Graham09 You have found some good advice here. Get an electrician to disconnect the storage heater from its timer, remove its wire from the wall and put in a socket, then plug in the storage heater through a timer switch. Set it to only come on midnight to 7 am. Finally tell SP you need an Economy 7 tariff.
The only doubt I have is if the meter is owned by the care home you have to get their permission to make changes.
If all this is too much disconnect the storage heater and use a fan heater in the daytime, but get switched to a normal tariff.