the initial Freecall would wisely be transmitted 'Odiham G-ABCD'. The controller may then ask for your details by return
Not according to CAP413,
Initial Call – VFR Flight
3.28 Normally, the initial call to an ATS unit should only include the minimum
information needed to establish:
1. The service that an enroute flight requires; or
2. The clearance/information that a joining or departing flight requires.
Westbury Approach, G-ABCD,
Request (type of service)
Westbury Tower, G-ABCD,
Request join
Odiham G-ABCD
Request diversion to Odiham