The prohibition notice ­issued by the UK Health & ­Safety ­Executive (HSE) related only to upgrade work on the separator and did not affect operations elsewhere on the FPSO, which operates on the Dumbarton field in blocks 15/20a and 15/20b. ­Output was not affected.

Maersk Oil’s UK managing director Tom van Leenen said the first-stage separator had not been used for about 18 months before the notice was issued.

He