Well I am pleased to report a reply. Here's the resultant exchange of e-mails:
"Thank you for your valuable enquiry at Haslar Marina.
I am afraid the short stay charge of £8 does apply regardless of the Lightship usage.
Please do not hesitate to contact us should you have any other questions. We hope to see you soon.
With kind regards,
Haslar Marina Manager
Dear Mr Lippiett
Thank you for your prompt reply.
Unfortunately, effectively adding £4.00 each to the price of a cup of coffee - or even to the price of a meal - for two people means that you are unlikely to be seeing me or a considerable number of other potential sea faring customers for the Lightship whilst such a high charge remains in place.
I very much hope that you will give serious consideration to relaxing the application of the full charge in the future (possibly by way of a full or partial refund to those whose stay is less than two hours and who can provide a receipt to prove Lightship usage?) in order to promote both your marina and the Lightship.
If you do so, please let me know.
Whether or not I receive a further reply remains to be seen but further e-mails from those interested in using the facility can only help.