As someone who has just been down the whole hydraulic steering rebuild path the importers for the LS cylinder is
EUROPEAN MARINE & MACHINERY AGENCIES
Calmore Industrial Estate - Totton
SOUTHAMPTON Hampshire SO40 3ND
TÚl.: (44) 2380 58 00 20
Fax : (44) 2380 58 00 21
A guy called Leo was extremely helpful on mine, you can get rebuild kits for there units just rebuilt both the pump and cylinder, only had 4 broken springs out of 5 in the cylinders on the helm pump - could have explained the steering issues!!
Sorry no idea on the pump.