HP Pavilion dm3-1020EA, Aluminium 13.3-inch Notebook (Windows 7 Home Premium 64 bit, AMD Athlon Neo X2 Processor L335, 4 GB RAM, 320GB SATA HDD, Ethernet, Bluetooth, 6 Cell Battery. This is £585.80 at Amazon at the time of posting. Please note the spec, this is not a netbook.
HP say battery life is "upto ten hours", Amazon say six hours.
This notebook also comes with an external dvd drive, a "LightScribe SuperMulti 8X DVD±RW with Double Layer Support"
I placed an order for one of these using discount code VCCODEHP which took £52.90 off, I paid £ 476.10p total.
I also got £38.08p from Quidco so this has cost me £438.02p after quidco payback, saving £147.78p off the Amazon price.
The user reviews at Amazon are good, 3 five star ratings.
Detailed specifications & link to Amazon listing in the first post