From SSE's response to BBC Watchdog's investigation of energy suppliers
http://www.bbc.co.uk/blogs/watchdog/2011/10/energy_switching.html
"For the winter period (December to February), SSE will not disconnect the gas or electricity supply of any customer, unless there are issues of safety or criminality involved."
Well, its not as if pulling the fuses would cause physical hardship. And next month is March, from whence SSE can presumably disconnect defaulting customers at their discretion.