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I think it all depends on whether it is busy or not and how long the moorings are. If it is busy, certainly moor up as closely as is polite. If there are not many boats about at quiet times of the season then a bit of space between the boats is ok. Basically its common sense.
Though moorings are very changeable thru the day as boats are all sizes please as boaters don't loose the shuffle up to let someone in overnight. If you won't shuffle then you can't moan about late cruisers. Regards Marge and Parge