« Reply #85 on: Friday 10 May 13 21:22 BST (UK) »
I feel sure that the two lines are written in a different colour ink. A lab could confirm this. It would also be likely that each writer - if two different people would add their name at the end of the line and might then revert slightly to a normal letter. For instance the last name second line might be Janet or something similar beginning with 'J'.
I was in the RAF from 1951 to 1954, so can relate to the time period. Being so definite that the place is Chepstow, I would send the photo to the Chepstow and Caldicot News -
http://www.chepstow-today.co.uk/index.cfm Someone might then be able to identify the friend or even know 'Mam'. They might also be able to identify the army base. The photo is clearly taken outside as you can see some bushes and the side of what looks like a wooden hut to the left, and a window to the right. Never stopped in Chepstow myself, but drove through there many times around those years going to and from Barry. Winter of '51 I was stationed at Credenhill, Hereford but mostly travelled from there by train to Cardiff.
Hutton: Eccleshill,Queensbury
Grant: Babworth,Chinley
Draffan: Lesmahagow,Douglas,Coylton, Consett
Oliver: Tanfield, Sunderland, Consett
Proudlock: Northumberland
Turnbull:Northumberland, Durham
Robson:Sunderland, Northumberland
Dent: Dufton, Arkengarthdale, Hunstanworth
Currie: Coylton
Morris and Hurst: East Retford, Blyth, Worksop
Elliot: Castleton, Hunstanworth, Consett
Tassie, Greenshields