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If you didn't mind a 2.5hr drive, Sizewell Beach in Suffolk is dog heaven and well worth a day trip.
Can also recommend Sandwich Bay beach which much closer. It's on a private estate and you have to pay an entry fee but the advantage is that it is deserted even in summer so it's worth consideration.
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Wrabness, just near harwich. More of an estuary really, but completely beach-like with stunning views of the stour and the “house for essex” and nobody gives a fuck about dogs / no dogs. It’s a small walk down a track, part of the fun of it of course with the dog. Also a smashing woods nearby for cooler walking.
Any suggestions for a beach for a day-trip from Ldn which is dog-friendly in the summertime? Reachable by car or preferably train.