Got a leaflet today offering this, number to call is 08442 411 777. No code or anything to quote, I just called up and asked for it.
Gets you both HD movie packs and the bonus channels and access to the 500+ movies on Sky Anytime.
Usually £16 per month.
31 days notice required to cancel, so was told to call up in just under 2 months time if I don't want to keep it and pay full price.