Great offer at ASDA... not
Maybe they are betting on the fact that most of thier customers don't understand that 200p [i]is[/i] £2.00
My guess is some sort of screwup when they converted prices from p to £ in the database. It automatically printed the sticker (since 2 < 200) in a batch of other, less stupid ones, and nobody noticed.
"Was $4.00 USD, now only £3.00!"