He became a close friend of the actor William Charles Macready, whose diary is a major source for Birch's background and life.
[3] Birch's second command Britannia ended in a wrecking on the Goodwin Sands off the South Foreland on 24 January 1809, in company with the Admiral Gardner and the brig Apollo.
[6] Birch in retirement from the sea resided in Gower Street, London, and at Pudlicote House, near Shorthampton in Oxfordshire, built in 1810, which he purchased in 1822.
[13] Macready while he was on tour in New York, and hearing of Jonathan Birch's death, called him "my dear friend and relative".
[7] Birch, described as of St Pancras, London, married Mary Elizabeth Morrice (died 1822), daughter of William Morice.