Upgradable and laptops doesnt go in the same sentence. Usually it is the ram and the hard drive and that is all.
That would be an ideal laptop to suit your needs with its large screen, reasonable graphics. And the £70 saved could buy you another gig of ram to make it really fly. For the course you are doing screen size is more important than anything else.
However do consider you could get a more upgradable desktop for your money that would be even better. Laptops while portable still have the same amount of cables. Mine here has 5 USB leads, speakers and all manner of other things that are in and out all the time. It is more untidy than a desktop.