Don't know about entitlement to wear one, however, to be issued one, which is what this discussion is about, there is a definate qualification criteria
QUOTE:
The Golden Jubilee 2002 medal will be issued to the following personnel:
All personnel who are in paid effective military service with the Royal Navy, Royal Marines, Army and Royal Air Force on 6 February 2002, who have completed 5 calendar years service and were enlisted on or before 7 February 1997.
All personnel who are in effective military service with the Volunteer Reserve Forces on 6 February 2002, completed five annual bounty earning training years and were enlisted on or before 7 February 1997. One of the bounty years must have been the year 2001-2002.
A member of the Regular Reserves who is in military service on 6 February 2002 become eligible if their aggregated Regular and Voluntary service amounts to the 5 year qualification period.
Any member of the Military Provost Guard Service whose MPGS paid service equates to the 5 year qualifying period.
Contracted Royal Fleet Auxiliary personnel in service on 6 February 2002 who have completed the 5 years qualifying period.
Cadet Officers and Cadet Adult Instructors with a total of 5 training years service, providing the service period includes 6 February 2002 and they are part of an established post. The person must have started on or before 7 February 1997 and the year 2001-2002 must be part of the service period.
A member of the 'front line' emergency services, accessed via the telephone number 999, who have completed a minimum of 5 years reckonable service on 6 February 2002. The emergency services include the Police, Fire and Ambulance Services, the Coastguard, Royal National Lifeboat Institution and Mountain Rescue services.