Hi, Karl, this is a subject upon which I could write screeds. As Chris says, all 'no standing charge' tariffs have been abolished on orders from the government, meaning people like me living on their own - and thus being very low users - were hammered with large increases. I actually bit the bullet and moved supplier, but this was not the easy move some people might tell you.
Recently my fixed price electricity deal came to an end and the standing charge was due to go up by more than 200%. After much phoning (always on their Freephone number!) they finally offered me a much better deal by letter: I received the letter on a Saturday morning, and when I rang on the following Monday, they told me that tariff was no longer available! After much more phoning/writing, because I had the offer in writing they relented and I got the good offer fixed for the next two years.
I'd invest a few hours in ringing round the major suppliers - Freephone numbers available at
https://www.saynoto0870.com/
and keep going till you have something that you're happy with. They always want to ask you about your annual usage, but I find it much easier to ask them what the standing charge is, and what the unit charge is and compare that way. If it helps, at the moment for gas I'm paying 2.679p Standing Charge, and 15.2p Unit Charge (Npower)
Good luck!