Stayed with SSE but switched to SSE one year fixed v11 today. Should save me around £125. Isupply or OVO could have saved me a further £40 based on my calculations but rather have the peace of mind of full E10 support.
Thanks for your help Michael.
Also they confirmed that you can switch to a different SSE tariff without incurring fees so if a better fixed deal comes out later in the year, there’s no issues.