Lenses will fit no problem but you will not get a Canon warranty which is probably 2yrs if its the same as Nikon. You will get the shop warranty which is crap. Have you considered Nikon? You can but a new d3000 with Nikons UK 2yr warranty with vr lens for
£300 on amazon Nice camera and within your budget. Nikon and Canon are the 2 biggest players in the dslr market so there are plenty of choice for lenses and accessories for the both. You got £50 spare to buy a tripod which you will need if you want to shoot landscapes.