HI, what an excellent site, thank you. I’m a relatively new E10 user I’m with Ovo and I’m in Isle of Wight. 
2 days ago I discovered that the times I was given by Ovo, namely 12am-5am, 1pm-4pm & 8pm-10pm change in British Summer Time to 1am-6am, 2pm-5pm & 9pm-11pm. I was not informed of this and no where in my contract does it inform me. So since the clocks went forward in March I estimate that I have used approx 100hrs of on peak lecky thinking I was using off peak. Please be aware if you’re not already. I’ve made a complaint and am awaiting a response and unless I get re-reimbursed I shall take it to the ombudsman. I’m strongly of the opinion that they lied by omission which amounts to fraud. I will also be changing supplier in January when my contract is up, so thanks again for all the info.