Volunteer Fireman - London WW2

[Teletran]

Good evening,

Are there any surviving records of Volunteer Fireman in and around London and Surrey from WW2?  My great Uncle was 37 years old when the war started so likely deemed 'to old' to sign up and as such joined the fire service. I wondered if any documents are in the public domain? Do any 'service records' exist or similar?  Any help is greatly appreciated.

Kind Regards

Teletran