« Reply #15 on: Monday 16 April 18 22:18 BST (UK) »
If your father has recently seen his birth cert - there should be an address where he was born and an address for Florence at the time of registration.
At the moment we are waiting to hear back (possibly after many weeks) from a court whether it is known what Florence's birth date was and what her address was at the time of my father's birth (10 Oct 1947).
While you are waiting, there should (as Carole says) be useful address information on the certificate itself. If your father was not provided with a copy of it, it is open to you/him to order it from the GRO in the usual way, using the index information available from FreeBMD.
Ayr: Barnes, Wylie
Caithness: MacGregor
Essex: Eldred (Pebmarsh)
Gloucs: Timbrell (Winchcomb)
Hants: Stares (Wickham)
Lincs: Maw, Jackson (Epworth, Belton)
London: Pierce
Suffolk: Markham (Framlingham)
Surrey: Gosling (Richmond)
Wilts: Matthews, Tarrant (Calne, Preshute)
Worcs: Milward (Redditch)
Yorks: Beaumont, Crook, Moore, Styring (Huddersfield); Middleton (Church Fenton); Exley, Gelder (High Hoyland); Barnes, Birchinall (Sheffield); Kenyon, Wood (Cumberworth/Denby Dale)