One major national broadcaster was still specifying ads to be supplied in SD which were then upscaled to HD for transmission! Very noticeable during their breaks, even now. When an advertiser contracts a broadcaster for airtime the broadcaster has to provide that airtime regardless of whether the copy is wrong/out of date or not quite the quality we would all expect. How many times have we seen Christmas ads in January because the advertising agencies are often off and forget to supply replacement copy in time? The broadcaster would be in breach of contract by not running the old copy even though it is out of date!
So whose fault would it be in Ofcom's eyes if an advertiser ran a pay-to-enter promotion on, say, Watch, with a closing date that was aired after said closing date? Say it was one of those "solve this ridiculously easy wordsearch that a 2 year can do and phone this 0904 number with a chance to to win a fortune and then some more, lines close on April 1st" and then that's aired by Watch on April 3rd?