Hi again Bob,
Now you have got me wondering? I think your question is very interesting and i would hope somebody would know the answer.
Neptune two is listed as TSST and Calshot as TSS T/T, i assume that the difference in size and multiple use of Calshot, ie as a tender, could really open my original question for scrutiny.
I can only assume that the old gent was refering to tug boat and not tug tender, it will be interesting to hear other members views because we are perhaps splitting hairs now.
All your fault of course, hehe.
I look forward to an interesting debate now and really do hope we find the answer.
Thanks again for the info M8.