An Integrated ATPL includes an MCC (Multicrew Cooperation Course) which is what the likes of Oxford provide.
CTC provide their own unique AQC (Airline Qualification Course) with multi crew endoursement instead which they say is more relevant and better prepares you for the airline world. Because of this they are allowed to provide an integrated CPL/IR course, but you still end up with an ATPL license once you get your 1500 hours.