Below is a round-up of the birth announcements from British newspapers. Sources include a national paper (The Telegraph, The Times) and a broad range of local newspapers from across England, Wales, Scotland and Northern Ireland.
Sibling names are in brackets. No official surnames are included; any name ending in a surname is actually a middle name.
Boys:
Augustine Charles David "Gus"
Alfred Sebastian (Matilda Rose "Tilly")
Douglas Patrick (Maeve Eleanor)
Finley James Charles
Oliver Samuel (Alice & Oscar)
Vincent Sam
Girls:
Athena Rainbow Twinkerbell [sic] (Ottilie Winifred)
Flora Lavinia Mary (Hector)
Grace Juniper Laird
Imogen Charlotte (Alice Olivia)
Mara Diana Annabel (Sam Herbert & Guy Charles)
Maud Charlotte Angela (Oscar & Bertie)
Tiggy Isabel (Orlando Dare Fiteni)
I cross-reference older BAs to find the full names of the siblings, however often they are missing (especially the eldest siblings, or for half-siblings) which explains why you will sometimes see something like: George Henry (Lucy, Emma & Jack Arthur). "Lucy" and "Emma" may well have middle names as well; I simply cannot find them online.
