You have not given enough information to allow a comprehensive reply, you obviously do not understand the privileges and requirements of the licence and rating that you hold.
Your CPL is valid for 10 years from the date of issue, nothing needs to be done within that time to 'revalidate' it.
It may be that one or more of your Class or Type Ratings has expired, you do not say whether that is the case. If so, you will need to pass a Licensing Proficiency Check (LPC) on either a Single Engine Piston (SEP) aircraft or a Multi Engine Piston (MEP) aircraft or an Operational Proficiency Check (OPC) and/or LPC on a specific type.
In order to renew your Instrument Rating you will have to pass an IR Proficiency Check, the content of which is identical to the initial IR Skill Test. The days of incompetent instrument pilots getting away with a quick 'renewal' with the local IR examiner are, thankfully, long gone. I suggest you brush up you limited panel U.P. recoveries - we're very hot on those, also limted panel turns.
Given your expressed attitude to instructing, I would not recommend renewing your FI rating. You are clearly unsuited to such a demanding occupation.
Oxford do not now and never have had a '737 simulator' they used to have a pair of very poor and unrepresentative generic twin jet procedure trainers, which did not merit approval under JAR-STD, and have recently obtained a slightly better generic twin-jet procedure trainer loosely based on the 737-400 which will, probably, achieve approval as a FNPT II. Any 'time' that you may have spent on these trainers is, for licensing purposes, wasted.
Incidentally, the Civil Aviation Flying Unit (CAAFU) has not existed for at least 7 years.