Until I can get round to replacing a door frame I need to fill in where ants/termites have got at it. What products are available please?

Probably a better response on DIY forum but there are many types of wood fillers in places like Homemart etc also available in the colour of wood you are filling.

To save replacement if you wish you can treat your old door frames from investation first, then fill with wood filler rub down and redo in your prefer coating.

In situations like this its always best to post a photo.

Depending on how bad the wood is or isnt, you may get away with with cutting out the offending area and replacing with another strip of wood, then paint/stain to match.

Wood filler is available in HomeWorks and HomePro.

It's expensive and there's a limited choice of colours.