What size? £1000 could buy you a dell m17x r3 from the outlet store if you're lucky enough to find one, but they are pretty hefty machines. The M14x would be under £1000 with the right discount codes and eurogamer discount.
The N55SF from asus seems to be a good priced option. GT555m graphics and blueray for around £750 and its a 15.6" machine. I believe the spec of these change a lot so make sure you compare before you buy. For example some come with 1600x900 displays and others have the 1920x1080 screens.
The latest MSIs (GT683, 780DXR) seem to be over £1000 but you may get the last generation ones (660 etc) for under £1000 and they'd still do everything you need.
I'm sure there are plenty of other options but that's what I'd be looking at for that budget.