Thanks Dennis.
Last week ,hauling out for the first time , I had a chance to use my electric winch.
It's a Warrior C4500 , mounted on the 50mm tow hitch and powered by the car's battery (engine running whilst hauling out). Nominally rated at 4500lbs , this reduces to less than 3000lbs on the third layer of the cable on the drum. The cable is 14 metres long.
The slipway , at Wells next the Sea , is moderately step with a good concrete surface. Parking the car , a BMW 318d , on the level , meant the trailer was c. 30 metres from the trailer , on recovery. Using the cable , strops , and 10mm nylon the trailer was comfortably hauled up the slip in a couple of stages . Chocks and the trailer brakes allowed the change from rope to cable.
On reflection , a straightforward procedure , keeping the car well away from the water.
Ian