They don't offer this very often (and their parallel BTshop which used to do this nearly all the time, doesn't either):
(Don't forget plenty of opportunities for upto 3% cashback sites eg quidco too...)
"FREE DELIVERY ON ORDERS ABOVE £99.00 INC VAT THIS WEEKEND ONLY!!
Yes, that's free delivery* on any online order above £99.00 inc vat from 5.30pm on Friday 25th April 2008 until midnight on Sunday 27th April 2008.
"What's more, there are no weight surcharges for hefty items so don't miss out on this great promotion, especially if you're considering a large and heavy purchase like an LCD TV! "