Found by @twitaculous

This is a competition from Tim Burgess Login To Enter »

Retweet for a chance to win a limited edition Then Diagram A3 print. Only 200 will ever be made, the other 199 go on sale on Friday at 5pm. Winner picked at random at 4pm on Friday. I’ll sign the print if the winner wants it signed ; )

Sometimes promoters tweet more than once.
Tweets will only get updated when you re-fetch them. This helps you because competitions will no longer "jump" between pages when competitions get added or competitions finish while you are browsing them. Competitions get "fetched" when you login or manually re-fetch them with "Forget Ended Competitions & Fetch New Ones". Additionally hidden tweets will stay visible until you "fetch" to save reloading the page and save you from losing your position.