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:
Arthur Henry
Benedict Mungo (Helena Lucy & Felicity Maria)
Benjamin John Lawrence (Zachary Paul Edward)
Edwin Tudor
John Vickers MacKenzie
Milo (Teddy)
Milo Henry Sebastian (Freddie & Ottilie)
Oscar Bek Thomas (Elif Marjorie Mary)
Oscar William
Rudy James Paul
Thomas Gabriel (Mia)
Walter George Spencer
Girls:
Adelaide Coco Elizabeth
Ava Rose Gwen
Lily Sophia
Martha Anna Rose (Florence Olivia Alma)
Sydney Isabella
Thea Susan Julia (Martha Grace Daisy)
Twins:
Florence Ida & Beatrice Eleanor
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.