Hi,
Another popular option for an outing was a trip to Margate. I did not set a date as I wanted to gauge interest first, well nine of you voted for it.
From my last trip in 2018:

This shows some sights of Margate old town, there was a carnival/fair shop, Cliftonville Lido remains and Walpole bay, which has the largest tidal pool in the country. There also a number of rockpools in Cliftonville and nearby Botany bay.
The big question, when do we visit?I'm away 20th-29th June and 31st July to 4th August.
Perhaps a weekday middle of July or mid to late September (we'll fix a date for Orford ness first)?
I'm avoiding August at it gets very busy in peak summer.
Opinions and ideas welcome.