On 11/05/2020 12:25, charles wrote:
I have a window where the sill started to go about 6 or 7 years ago, I cut
out the bad bit, used wood hardener and did what I thought was a decent
repair. The rest of the sill has now decided to give up, so I'm having a
new window fitted. The original was early 1970s Magnet. (before we bought
the house)

This repair is on an added porch from a few years back, I reckon cheap
wood but as approaching 70 and maybe only 10 years life left I can maybe
manage to prolong the frames so I dont have to replace it and leave it
to someone else to do. :-)