EDIT2: Today early morning 22/01/11 several N5010 units appeared at much more resonable prices - so it's still worth checking on a daily basis.
EDIT : Since Dell introduced the kiss of death money off voucher - pricing has gone up significantly !!! The system I got for £348 two weeks ago now costs £365.90 EVEN WITH THE £25 OFF VOUCHER APPLIED.
A few good deals on well specced i3 and i5 15R/N5010 Inspirons at the moment with free delivery offer.
Best times to check are mid morning and mid afternoon
Select IN5010 under Family list to see them - picked up an Inspiron N5010, 500GB, 8X DVD+/-RW, 4GB, i3-350M(2.26GHz), Windows 7 Home Premium (64 BIT) for £348 delivered - not too bad !