Subsea well apparatus and method comprising a tree (26, FIG 2) with at least one hydraulically operated valve (51, FIG 2). Control module 50 and a hydraulic input/output arrangement 30/73 provide and receive hydraulic fluid between an external device 70 and the valve/s. The external device forms a closed loop hydraulic system with the external device. The external device may be a remotely operated vehicle / ROV. A pump 82 in the ROV may repressurize hydraulic control fluid returning from the subsea control module / SCM. An umbilical 72 may connect to a hydraulic fluid source and also carry an electrical line 76 and be connected to the ROV. A further independent claim concerns a skid for a subsea ROV which has a reservoir for hydraulic fluid, a pump and a junction to make a hydraulic connection to a subsea device.
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