The Official Roll of the Baronetage shows the baronetcy Biddulph of Westcombe as being vacant and therefore
Sir Ian D'Olier Biddulph, 11th Baronet has died. Wikipedia states he was known as Jack. A recent facebook post on "Wattles Memories" by Paul Biddulph indicates he died on 28 August 2024 with funeral in Brisbane on 4 Sept
He was the son of Sir Stuart Royden Biddulph, 10th Baronet (1908-1986) "jackaroo of Queensland" and (m 1939) Muriel Margaret Harkness (d 1995). He m 1967 Margaret Eleanor GABLONSKI and had a s and 2 d.
His only son (Sir) Paul William Biddulph b 1967 has succeeded as the 12th Baronet (subject to proving his claim). He m 2000 Susan Kay ADKINS and has 2 d
The heir presumptive appears to be the new Baronet's 2nd cousin MICHAEL ANDREW BIDDULPH b 1964 (descended from the 9th Bt). He m 1989 Tamara KELLY but DPB does not list any issue. He has three younger brothers all listed as unm by DPB so maybe they have lost touch with this branch of the family.