Hi Sue
I have looked through my records and neither are shown as killed on duty, but all is not lost.
If you contact the Kent Fire Brigade Museum (Mondays only usually) and ask for John Meakin, he has records going back to the dates you seek, so there is a good chance he can tell you more.
John is ever so helpful and has helped me on many occasions.
His details are
Kent County Council Fire Department
Straw Mill Hill
Tovil
Maidstone
Kent
ME15 6XB
England
Tel 01622 692 121
(this number is the brigades switchboard, so ask to be put through to John Meakin (or anyone else in the museum as he has a few helpers)