Best answer by woz
If you really aren't using ANY gas at all (cooking/gas fires/water heaters etc.?) and you were to have your meter de-energised (but see below) then based on price alone PP isn't the most competitive but it's not by as much as you might think... assuming you use 7000kWh it could be a maximum of £100 per year with only one new provider, but in general around £40 to £10 less per year with a more "proven" cheaper providers. PP is more competitive than you might think, but of course given the recent weather that may change; (I hope not!)
Assuming you might use a little gas, I've looked at the next cheapest providers and if you were to take dual fuel then the breakpoint becomes (and this is a VERY general comparison as there are a number of factors which vary) that you would have to use around 11000kWh to 12000kWh of gas for PP to become "even" based on price alone. I assumed you use say 7000kWh of electricity for this comparison; (the "quoted" UK average is only 4600, but you have electric heating).
If for example you only used 3000kWh gas per year PP would cost £30 a year more so not really a big deal.
You need to give the idea of having the gas meter disconnected/de-energised much research - it could cost a lot in both aggravation and/or money to have it de energised and more to the point later re-energised. I suggest you make enquiries about both before you take this step.
I'm sure there are reasons you've gone all electric, but even taking into account the reduced efficiency of gas heating compared to electric heating (assuming for example 80% efficiency for gas v. 100% for electric per kWh) it still costs a lot more to heat your house with electricity than with gas. (This does not account for installation costs).
Good luck in whatever you choose!