All done with thanks to all - in particular for Will37.
It was a most enjoyable puzzle at about the right level of me so my thanks also to Awinger. It was a welcome break. As it happens I am the Agent in my rural constituency for one of the four 'A' s. I shall be glad when it's all over after the Saturday count
The help on the Forum is much appreciated, so I won't reveal which of the four 'A's in case it puts someone off in the future!