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Marc, it looks like you've got this mostly covered now but my original suggestion, which will still stand if either Richard or Gary is unable to help come the time, would be to try Langley Dyke. It's very close to Gary's suggestion of Cantley and is completely sheltered - you won't be encountering wind or tide there!
If you do stop at Cantley be sure to go to The Reedcutter. Not mentioned on here in recent times but, having had lunch there last Saturday, dinner there last night and a quick pint there this afternoon I can confirm it is still a top notch place to go.