Okay, here goes. . .
Finally got hold of the Operations Officer, and to use the slipway, they need proof of liability insurance, covering letter detailing purpose of usage (ie leisure or business, dates, times etc) as well as a risk assessment (carried out by the potential user)
AND possible payment, but he couldn't tell me what that would be until the documentation was passed to SPT's legal department (got impression though that it would be nominal if anything).
Anyway, am now the New Best Friend of the chaps who operate the ferry and slipway and will be working on the risk assessment over the weekend having picked their brains to pulp
Will send you a copy Pol', and anyone else who may need one in the future. . .
Suspect it will be rather easier in the long run once all this is done. I hope.
Now - back to the new lights