So sadly the bicycle will not be here after me, except in pieces. A close look at the cantilever post showed that it was very weak from the impact and being bent back so I decided to call it a day.

For information I tried the Shimano Altus cantilever brakes but the front fork is too narrow and they don't fit.

I will sell the bike for spares having removed the front brakes. Somebody could decide to change the fork, and I might check at the local bike co-op first to see if they have anything. Should I also break off the canti-post to be sure nobody tries to sell it on to an unsuspecting person?

Thank you for all your advice.
Gill