Just logged on to laptops direct and noticed a banner at the top of the page saying they were doing Buy one Get one Free on laptops when you purchase an extended 3 year warranty.
Basically, if you buy a laptop for under £400 and then pay £70 for an extended 3 year warranty, after 3 years you send off your old laptop and they send you a new one to the same value of what you paid at the time. I imagine £400 would probably buy you a pretty decent laptop in a few years.
Sliding scale for higher priced machines:
£79.97 laptops up to £750
£89.97 up to £1250
£99.97 up to £3000
Not strictly BOGOF I suppose since you have to surrender your old machine but might be of interest for some people...