Had a look-see and found these,
Over budget, battery 3.5 hrs, 8 gig ram, http://www.johnlewis.com/toshiba-satellite-l870-18q-laptop-intel-core-i3-2-5ghz-8gb-ram-1tb-17-3-white/p436078
Within budget, review says battery 5 hrs, HD only 500GB, http://www.amazon.co.uk/Toshiba-Satellite-C870-1H2-17-3-inch-Notebook/dp/B00B18B3OW/ref=sr112?s=computers&ie=UTF8&qid=1368544901&sr=1-12&keywords=laptops
Last, HDD 500GB, within budget, you'll have to search for battery life. http://www.amazon.co.uk/Asus-X75A-17-3-inch-Laptop-Black/dp/B009REFFQO/ref=sr140?s=computers&ie=UTF8&qid=1368544963&sr=1-40&keywords=laptops
Check delivery charges. Just pointers to your budget. I'd do a bit more searching in case you come accross a better bargain. Good hunting.