My local independant charged me £150 to replace a core plug.......
In fairness, it ws the one behind the flywheel so required complete engine removal I shudder to think how much a Morgan garage would have charged for the same job.
"Y mae dafad ddu ym mhob praidd" 1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10