I checked the receipt:
Remove carb and carb base, strip and clean carb, renew gaskets, filter and needle valve. Attempt to free off base plunger. Supply and overhaul good second hand base. Reset tappets, renew rocker cover gasket. Reset points and check and adjust timing. Change oil and remove and clean filter (centrifugal). Renew seal and refit.
Replaced rocker cover gasket
Carb gasket kit
Oil filter seal
Carb base and plunger
Weirdly, I checked the oil. It looks like they did not, in fact, change the oil. It is still quite dark.