Haven't a clue, sorry but someone will help, you won't wait long.
I just wanted to say I haven't heard the acronym 'Blesma' (British Limbless Ex-Serviceman's Association) for a long time. I heard it spoken of as a child because my grandfather had lost a leg in the WW1's Battle of the Somme & he got help & support from them.
I'm surprised that it still exists.