The Official Roll of the Baronetage shows the Hill of Brook Hall baronetcy as now being vacant from which it follows that
Sir John Alfred Rowley Hill, 11th baronet has died. I have not being able to find an online notice of his death at the moment.
He was the son of Sir George Alfred Rowley Hill, 9th Baronet (1899-1985) by his 2nd m 1938 to Jessie Anne ROBERTS (d 1995). He succeeded his half-brother, the 10th Bt, in 1992. He m 1966 Diana Anne WALKER and had an adopted s and d.
He is succeeded as 12th Baronet by his kinsman (descended from the 2nd son of the 1st Bt) Sir Marcus Adam James Hill b 1974 (subject to proving his claim and being entered on the Official Roll of the Baronetage) resident in Australia. He m Aug 2004 Sallyanne Rebecca GLENNIE and they have issue:-
1. Rhett Stephen b 2004 (not clear whether he is the ha)
and two sons Braedy Adam HILL b 1996 and Keanan Marcus Leo HILL b 1998 by Narelle Catherine BYRNE