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:
Cedric John (Cyril)
Percival Desmond Raiph (Cosima Louise Cecilia)
Sidney Oliver
Struan Cameron (Skye Alexandra)
William Jack
Girls:
Araminta Maisie Joy (Arabella)
Bodhi Michaela (Atticus Jack)
Bridget Catherine Mimi
Camilla Averil
Cecelia Violet (Harriet)
Claudia Cécile
Iona Gail Isabel
Megan Angel (Owen James, Jack Michael, Isaac Matthew, James Alexander & Luke Edward)
Ottalie Elizabeth
Poppy Ocean (Daisy Alexandra)
Twins:
Rafferty William & Poppy Cleone (Oscar Henry & Wilbur George)
William & Toby (Poppy Alice & Cecily Anna Iris)
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.