I have been living out of the UK for a while and due to return soon. Since I've been away, I've discovered a love for fresh whole prawns, which I can buy at any local supermarket relatively cheaply (about £0.90/100g for good sized prawns, similar to tiger prawns), so I buy them all the time.
Coming back to the UK, can anyone tell me how much it would cost to buy them in a local fishmongers? Do they even sell them fresh in the supermarkets or are they just pre-packed? I never used to buy them so have no idea.