a mould for an injection moulding apparatus , the mould including at least two mould parts which mate to form the mould cavity and which separate to permit removal of the moulded article , each mould part including a relatively rigid body having an abutment face which abuts with an abutment face of the other mould part when said parts mate , the body of at least one mould part including a recess in its abutment face which is filled with a resilient material defining a portion of said mould cavity .