Seen an Acer Aspire 5622WLI for 599 quid. Seems to be a good spec machine if you're budget will stretch.
Intel® Centrino® Duo mobile technology, featuring:
Intel® Core™ Duo processor with 2MB L2 Cache
Intel® 945PM Express chipset with 667MHz FSB
Memory
1GB (2 x 512MB)
80GB
ATA/100 Hard Disk Drive
DVD-Super Multi Double Layer drive
15.4" WXGA Acer CrystalBrite™ TFT LCD with 1280 x 800 pixel resolution, supporting simultaneous multi-window viewing via Acer GridVista™
16.7 million colours
Graphics
ATI Mobility™ Radeon® X1300 with up to 512 MB of HyperMemory
MPEG-2/DVD hardware assisted capability
Communication
56K ITU V.92 modem with PTT approval; Wake-on-Ring ready
10/100Mbps Fast Ethernet; Wake-on-LAN ready
Intel® PRO/Wireless 3945ABG network connection (dual-band tri-mode 802.11a/b/g) Wi-Fi CERTIFIED™ solution, supporting Acer SignalUp™ wireless technology
I/O Interfaces