Thanks thats useful info.


After very careful measurement with a screwdriver down the plug holeI have put in Champion 704 which is what Halfords recon is correct. These have a thread length of 25mm.

All seams fine.

Set off for another 500 mile trip tomorrow so fingers crossed.


Cheers

Chris

Morgan 4/4 1997 Connaught green
Sunbeam s81955
Douglas mk5 1951