We got our tender - fibreglass, carries 3 or a family of 4, can be rowed or out-board, with a decent (soft) rubbing strake around the gunwhale , and a rudder, daggerboard and sail for those odd days at an anchorage) from Heyland Marine, Bourne End on the Thames (between the M4 and M40).
Its not quite South Hants, sorry.
