Hello, my g-g-grandfather John Edgar Ward was an Armourer Sergeant at the Gun Wharf Devonport, Plymouth in 1878 when his son Joseph was born. However, on his sons birth certificate it states the registration district as Portsea Isle and the 'When and Where' as 14 March 1878 Cambridge Barracks.
Searching on the web I've found that the Cambridge Barracks, Portsmouth was living accommodation for the military and is now a school but I have no idea as to why the birth would have taken place further along the coast from where the family was based. Did the barracks have a medical centre that would assist with births? Would welcome any local knowledge or suggestions.