Tuesday 16 August 2011, 16:03
A giant letter M, similar to the burger chain McDonald's logo, has mysteriously appeared on an island owned by TV writer and animal rights campaigner Carla Lane.
Carla Lane is famed for a string of hit TV comedies in the 1970s and 80s including Butterflies, Bread and The Liver Birds.
The yellow letter M appeared overnight on Saturday on the roof of an old, converted chapel and was spotted by local pleasure craft operator, Roy Gregory who runs his business out of Pwllheli marina.
The mysterious letter M photographed by Roy Gregory on St Tudwal's East island off Gwynedd.
Roy said: "I passed on Friday and it wasn't there, we didn't go out on Saturday because it was too rough, and then when I passed on Sunday I saw it," he said.
Carla Lane bought the island in1992 and the neighbouring island of St Tudwal's West is apparently owned by explorer Bear Grylls.
Do you know how it got there? If so, we'd love to hear from you in our comments section below.