Colin wrote:

You can buy the strip at Wickes. However I don't think it would work on
the edges of the doors if that's what you are suggesting, it would just
pull out of the groove.

I could route a groove in the frame but I am not sure how to do the bits
near the ground and the corners.

A dremel can be very handy for this sort of stuff.
Both as a very light-duty router, for tight spaces, and for getting rid
of most of the wood in that corner, before moving to the chisel.
Of course you can remove the door and hang it upside down to do the
groove at the bottom.