From the BBC:

 
It recently came as a shock on the underground when someone offered to give up their seat for me !

 
I remember, many years ago in my commuting days out of Bristol Temple Meads, sitting in one of the four vacant seats on a whole table, waiting for the train to depart, while I read some office paperwork. A family group approached along the aisle, discussing their wish for a family seating of four at a table. I promptly stood up and invited them to take all of those four seats, while I took a perfectly adequate alternative airline seat, further back in the carriage.

They were so appreciative, and vocal in their thanks - when all I had done was to have effectively reserved their table for them.

 
Again, I'm going off at something of a tangent, but I do like this nine minute clip, 'Darkest Hour | Winston Churchill Takes the Tube', from YouTube.

 
Back in 2012, a member of Romania's yachting team insisted that I take his seat on a bus on the outskirts of London  and in the next few years such offers increased; once I was strap-hanging on the Tube and ducked my head to look out of the window, prompting a young lady in the seat below me me to offer it to me.  In those days I could smile "no  thanks" and boast of ten-hour walks and half-days of voluntary environmental work.

Now I think that age and health problems justify me in taking a bus seat designated for less-able people and I usually get one, especially on outward journeys into town. But then the bus starts to fill up, with some passengers obviously more infirm than I.  On my last bus ride, about half of those on board seemed worthy of designated seats, posing the moral dilemma of whether I should offer mine.

 

I felt that way when I got on a full and standing Elizabeth Line service at Stratford this morning an I looked at the priority seats. "Please give up this seat to passengers with reduced mobility".  Does not apply to me - I can no longer stand for more than a few minutes, but that is not a reduced mobility. "Please give up this space if a wheelchair user needs it" - no, I am not.   Hmm ...

Of course, the person occurring the "reduced mobility" seats may have had reduced mobility - hidden diasbilies are just that - but I did feel I spotted a hole in their designation.  Disabled railcard, yes.  Reduced ability to stand, yes.  Able to use a priority seat, no.

 

It is in my view, and if I were still mobile (I'm now a wheelchair user), I would be offering my seat...

 
I have a recurring back problem, which means that sometimes I actually prefer to stand rather than take a seat.

 

My view would be that the wording should be "please give up this seat to passengers less able to stand" which - after all - is closer to the purpose of having seats available ...

I got a seat - the wheelchair one - at Liverpool Street.  No wheelchairs to be seen on this train.  Chris - you would have had it in proper priority

 

ChrisB, not me.