Big Mark and Vicki are blown away when someone comes into the shop with what appears to be a German Enigma Coding machine. But something about the seller’s story doesn’t stack up. So it’s up to Big Mark to try and decipher fact from fiction. And temperatures soar when Simon and Liam are offered the chance to buy some iconic saucy seaside postcard artwork. And the Marks get the opportunity to buy an iconic World War 2 weapon.