An access apparatus for enabling transfer of personnel between a seaborne vessel and an offshore installation is disclosed. The apparatus comprises a body adapted to be mounted to a deck of a seaborne vessel, clamping members adapted to grip a buffer tube, mounted to a support of an offshore installation, therebetween, to limit vertical movement of the buffer tube relative to the clamping members, wherein the clamping members can pivot relative to the body about a respective single pivot axis extending in at least two mutually perpendicular directions.