This is why you need to check the local laws as they vary around the country. Providing they are of size & unberried in Cornwall as an unregistered boat you can land two of lobster, crawfish, brown crab or spider crab per day. That isn't two of each, its either two of one species or one of one species & one of another.
Don't sell any of them as thats also illegal for an unregistered boat.
Cornish bit here: Cornwall Inshore Fisheries and Conservation Authority District Guide to recommended minimum fish and shellfish sizes