Flexible tubular structure

A tube comprising:

• a. a co-extrusion composite film structure having a plurality of polymeric layers;
• b. wherein the plurality of layers include a co-extruded inner layer defining an interior surface of the tube, an outer layer defining an exterior surface of the tube and at least one intermediate layer between the inner and outer layers, the intermediate layer being of a material compatible with the inner and outer layers between which it is interposed;
• c. wherein the co-extrusion composite film structure is jointless along its length;
• d. wherein the exterior surface of the tube is bonded with a resinous binder;
• wherein the resinous binder forms part of a second tube of fibre reinforced construction comprising at least one annular layer of reinforcement fabric comprising quadraxially oriented reinforcement fibres, said annular layer of reinforcement fabric being impregnated with the resinous binder;
• and
• wherein the exterior surface of the tube is treated by provision of a formation on the exterior surface to facilitate bonding with the resinous binder.