The GT 335M is a decent mid-range graphics card just a couple % points below the HD 5650 in 3DMark Vantage GPU benchmark.
The low power Core 2 Duo SU73001.3GHz CPU is a serious (IMO) impediment to getting the full benefit out of the GT 335M. Definitely underpowered compared to the i3-380M 2.53Ghz CPU of the Dell Ins 15R.CPU performance ranking
: Core i3 380M #55 / Core 2 Duo SU7300 #291
Here is a review of a new Llano laptop - not yet available in the UK (and probably well above your budget range as configured when VAT is figured in).HP Pavilion dv6-6110eg (Llano) Notebook review