Andrew, there are both wetsuits and non wetsuit swimmers. Bring wool layers to change into, and keep in mind it’s a big temperature drop, so stay close in on the first few swims. Listen to your body and get out early. There’s some helpful cold water swimming info on https://www.outdoorswimmingsociety.com.
Come around 10:30/11 and there should be people at the beach on Sat/sun.
PS if you can wear your wetsuit to the beach that might make it easier than trying to get into at the beach.Bring dry clothes, wool hat and a warm drink for post swim.