Anything better than expanding foam for this?

Slumbershade

Have had the rest of the door repaired and am very happy with it. I can't see myself being able to neatly trim the foam to the shape afterwards in this corner in which a few snails have hapilly made their home.

stuart45

Use some bits of brick and mortar to fill in. When it's gone off, render over, and then to finish flick on some render with a brush.

Simonon77

I would remove the wood as far along as it is rotten, then replace with new wood. If you cut it to size correctly will fill the old holes and once painted will blend in with the old wood.

You could also foam fill, and then use some upvc trim to cover all the wood along the top, which would also look quite neat.