Network 21

Background
Network 21 was a pirate television broadcast in London, England that operated from 1986 to 1987. It would only broadcast for around half an hour on Friday nights after ITV had signed off.

Logo (1986)
Logo: The word "NeTWork" on a blue rectangle above "21" on a grey square, like a calendar. The 21 slowly flashes different colours. Variants: There is a variant which displays a grid of several identical logos, all alternately flashing colours.

Availability: Shown at the start of each broadcast by the channel.