Twee: is it worth the hassle of changing tarriffs / suppliers ?
c) What options are available to me to fix my current prices ?
What would you do ?
Prices vary by region so you have to do your own comparison, but a region I tried highlighted a couple of possible options (1) NPower Go Fix 6 would approximately fix your current rates for another 12 months and (2) EDF Fixed Price 2014 would, at a premium, fix your rates for a further 3 winter seasons.
Disappointed that you use the word "hassle". It's only a few minutes to switch with a comparison website, sit back for 4-6 weeks and then provide closing readings when the reminder email arrives. (I've just done EDF FP 2014 and it was barely a couple of minutes).
Of course you (or I) may be unlucky and someone will foul-up the transfer.
Or you may be unlucky and the deals are pulled before you decide - because they appear to be a little out of line.