Jamie's Italian in Manchester recently. They are huge! Also known as mammoth olives, they are served on crushed ice with a black olive dip and crispy music bread. The olives are amazingly tasty and so big that you end up nibbling around the stone in the middle rather than putting the whole olive in your mouth in one go.
I used to be in the olive hating camp but now can't get enough of them. I have a trip to London planned in September with a visit to Borough Market which will involve lots of olive tasting no doubt washed down with copious amounts of sparkling wine.