Alfred Gordon MONTAGU was born 21 Dec 1840, and baptised at St James Paddington, London, on 16 Jun 1841, a son of Afred Otto MONTAGU and Eliza Anna Maria CANTY, who were married at St James Westminster on 13 Apr 1825.
Alfred Otto was a solicitor and in the early 1840s went to Hobart in Tasmania. He died there in 1849. If you Google his name you will get quite a lot about him, as well as his older brother Algernon Sidney MONTAGU who was also in Hobart, but as a judge.
Algernon and Alfred were sons of Basil MONTAGU and his second wife Laura RUSH. Basil was a "natural" son of John MONTAGU, 4th Earl of Sandwich, lots about him if you Google his name as well.
My interest in this family is mainly the RUSH side, being a descendant of one of Laura RUSH's younger sisters Angelica, who married the Rev Edward Daniel CLARKE.