Can I suggest going a little further west and doing it with Simtech in Dublin. As TheBeak says doing it on something classic is great fun. Simtech have a 737-200 and if you can fly that you can fly and glass cockpit airplane.
Ive heard bad things about the Oxford MCC. I have heard you do a lot of line flying and a lot with the autopilot on. Thats all fine but why pay to watch the autopilot flying the plane? Also in an airline interview sim check they want to see you can fly so its all manuel flying. In Simtech you will be constantly shooting approaches, doing single engine stuff etc all manuel flying in an old classic. A work out but great fun!