« Reply #14 on: Thursday 29 June 23 13:32 BST (UK) »
On the 1939 Register there is also Ernest W Cleal b.1877 and Matilda b.1879 who could be parents also in Finchley. Searched England and Wales and no daughter 'P' listed.
Matilda's maiden name was Furnell, so they are likely to be Frank's parents, given one of his forenames. You need to be looking for birth regs with surname Cleal and mother's maiden name Haskins. I find 3. The youngest seems to have died in 2010 (in her married name. there was a notice in the London Gazette in 2010, giving details of who to contact in the event of claims against her estate.
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins, Pembroke, Partridge
Dorset / Hants: Derham, Stride, Purkiss, Sibley
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Lanark: Scott (soldier went to Jersey CI)
Jersey: Fowler, Huelin, Scott