Many thanks to all of you with some good advice and hints. However, a small but for me pleasurable, complication has set in.
My 87 year old mother has just decided she would like to come as well. She is able to walk but would need wheelchair assistance with boarding. She also likes to get up to stretch her legs when sitting to help circulation and will need help with any AVOD / IFE system.
Clearly I will put her in Business with my sister etc in the back, but this changes the equation. Any more hints and help on airline choice would be most gratefully received.