Sam, we're getting peelers up in the mid to top reaches of Southampton Water, so you should be getting them on the beaches near you. Dead easy to spot...pinch the lower section of the leg, if it falls away and leaves flesh...the crab is a peeler, or ready to "pop". Bets storage, as I'm sure your dad knows, is in a tray, in the fridge, and spray them with sea water occasionally.
Peelers here are 80p each...extortionate if you ask me, when you can collect boatloads in one trip to the tide reach. If you get stuck, I'll try Marchwood, Magazine Lane, for some reason that is a prolific peeler harvesting ground.
Rich
Ps I'll speak to BB re. hermits for the chater trip ok??