Have you though about asking scottish power about if they have help for people on income support??
Im with Southern Electric. Southern Electric is owned by Scottish and Southern Energy which manages the largest distribution network in the UK.
I am on benifits and they brought my electric prices down from 15.07p per unit to 8.30p per unit.
Cause even though british gas have this Essential Tariff they are still more expencive than alot of Suppliers.
This Essential Tarriff basically gives people the price before there recent price rise.
Hope this helps.
Ian