No.
The provisions of the Work at Height Regulations apply to all work carried out “at height” where a person could fall a distance liable to result in an injury to them. MGN 410 states that for this reason, the “two metre rule”, previously used for land based workers and informally applied to maritime workers, no longer applies. The Work at Height Regulations apply irrespective of whether work is being carried out at 2 metres or above or below 2 metres.