If you only have 5 weeks, you may be better going to John Lewis not Mothercare!
I had a Silvercross Linear Freeway the Ventura car seat could go on it, but I dont like travel systems, it was ok, but they arent made like they used to and the chassis broke, and the wheel fell off the borrowed chassis!
Through my whole pregnancy I refused to even look at a bugaboo and was leant one while my pram was repaired (as i wanted rear facing) and i loved it so much, we got a refund on the silvercross (with the help of the wonderful staff at John Lewis) and saved to get a Bugaboo, I have had it for 2 months and love it, you can also put a car seat on the frame, the Maxi Cosi Cabrio