Wow, a lot of responses – many thanks to all.
IanT – I like the idea of the neoprene, I may add some as I have some neoprene sheet… somewhere…
John (Journeyman) – ah yes, the wife has some of that, I considered slicing off the adhesive as I didn't think it would mix well with oil.
Marischal – now you mention it, I recall that Morris Minors (and possibly classic Minis as well) use a piece of very suitable-looking felt as a bearing at the lower end of the steering column.
I searched further and found these which would probably do for the Boxford with one spare, and they are close to the correct shape already 
Pete – I'll take some photos when I get out to the 'workshop' later (it's not really anywhere close to a proper workshop yet).
Thanks again for all replies.
Stay safe.
Rob