About £250 -280k
My Father dies on 3rd February 2015
At present they do not cohabit; they spend alternate weekends either in Harpenden or Southampton. It is my understanding that when he retires, next year, they will cohabit.
Hope this is helpful
The best estimate I can give is £24k; this would give £96k as her mortgage capacity.
Thank you so much for your help; to be honest your final analysis is better than I had hoped for i.e.25% + my inheritance.