Apparatus for, and a method of, lining an internal surface (13) of a conduit (15). The lining typically comprises a tube structure (17) which is applied to the internal surface (13) of the pipeline (15), the tube structure being impregnated with a resin which upon curing forms, together with the tube structure, a composite structure which provides the lining. The tube structure (17) is applied to the internal surface (13) of the pipeline (15) by way of an eversion process. The apparatus (10) comprises a body (24) having a portion (63) confronting the everting tube structure (17) to in combination with an everting portion (33) of the tube structure (17) define a space (68) within the pipeline (15) for receiving the resin. The body (24) incorporates a ring structure (120) presenting a contact surface (125) against which the everting portion (33) engages as it moves towards the internal surface (13) of the conduit (15). Contact between the contact surface (125) and the everting portion (33) of the tube structure (17) assists in achieving wetting out of a layer of resin-absorbent material incorporated in the tube structure before it is presented to the inner surface (13) of the pipeline (15). The contact surface assists il spreading the curable resin and also in driving it into the fibres of the resin-absorbent material, as well as removing air from between the fibres. A vent system (140) is provided for removal of air from within the space (68). Further, means (110, 112) are provided for recirculating resin material which leaks from the space (68).