Just want to add that anyone with a severe mobility problem can get Passenger Assistance at train stations.
Earlier this year I had a fall which resulted in a fractured spine. I had previously booked to go from Paddington to Weston super Mare, a journey I have made on several times previously, but filled me with horror at the thought as it approached less than a month after that fall. I was having great problems walking more than few metres and had no idea how I was to get myself and my wheeled case around.
Paddington Passenger Assistance picked me and my case up at the underground exit and took me firstly to Waiting lounge, and from there to the train where they put my case on the train and waited until I was in my seat.
Was met at the other end in WsM and taken by them off the train and to the exit gate where I was met by my daughter.
Also TFL provided similar assistance as I crossed London on the underground system. Absolutely wonderful. I
I have had a Disabled Rail card for some years on the basis of my brown book for hearing aids, but have always managed without any assistance.
Cannot praise enough the assistance I was given.