pcpartpicker comes to £380 searching shops around the uk, yeah my spec I showed didnt come with OS but I can get a windows 7 key for £15ish and upgrade it to 10 for free can I (I think)? so that would make it (with your link and my theory) £315 altogether, so is £45 cheaper which can go towards a graphics card I suppose. Cheers as well, didnt know about that pc build site thing. (does have some compatibility notes at teh bottom about usb 3 ports though?)
But all in all, would that pc be any good ... like say I ran ksp, how would it be looking? and if it is/isnt, which graphics card would be good if needed? I really stuggle when I comes to knowledge about pc's soz