Blue, I know nothing of the North Sea, but in the US Gulf, I've never heard of anyone getting into trouble for making a precautionary landing. I've landed on third-party platforms more than once, & never heard a bad word about it. The personnel on the platform may not be really happy about it, if you're blocking the heliport for their ship, but there's not much they can do. Someday they may need to do the same thing on some other company's platform. Not making the precautionary landing, OTOH, can get you fired very quickly, if you live to regret it.