Thanks.  Got similar advice from the FB group.  Going to see Joe tomorrow.

Joe the carb for me..he bored the body and supplied  a new slide for about £50 . that was 4 years ago but it's worth talking to him..He's in St Albans.

Can anyone recommend a good restorer of Amal carbs?  I have a 276 off a 1934 Lion 600 that I think needs some TLC.  I have heard that Martin Bratby in Cannock has not ben well.  Close to the Oxford area even better!  I could go to Burlens and replace most of it but would prefer a good refurbishment.  Thanks.  Ken