I noticed your query, maybe this info will help.
Bell was a Naval Cadet in 1857, a sub-lieutenant 20 March 1864 and a Lieutenant in 21 April 1866
War Service - served in the Abyssinian campaign 1868 (Abyssinian Medal)
In the Navy List 1869 he is shown on HMS Brisk joined 7 September 1866
Gerald J. Ellott