No Moira, this is an issue that relates to MS's promotion in the USA and Canada. It is not available in the UK.

The deal was that if you bought a retail copy of Ultimate, you could have two copies of Home Premium for $50 each.

Over here the deal was that if you bought a new PC around Christmas you could have a "free" upgrade to Vista when it was released. This would invalidate your XP licence, but the intention was to boost hardware sales around the holiday period, given that there was a new OS in the offing.