So a postscript to my S1 cracked OZ wheel saga.
Following all the tremendous advice from the Forum; a week ago I drove up to Rugby with the wheel to meet Simon at SIFAB.
He really knows his Morgan's and metallurgy. Returned yesterday, collected a repaired wheel.
Tremendous service, someone who we should really support, dedicated to keeping our cars on the road at a very reasonable cost. Great outcome.
Graham