Just popped into my local Morrisons to check if they had the Ipod Nano deal on, but alas they were behind the counter at about £140 so don't think that deal made it to my store. Did notice that they had some Western Digital Desktop External Hard drives at what seemed like a good price though. Didn't say it was on a sale or on offer so may well be nationwide. Couldn't justify the cost seeing as I've got about 4TB of storage as it is.
Sorry for lack of info people, just thought I'd post anyway in case it helps someone!
It was in the Byker Branch, Newcastle Upon Tyne
EDIT: It's a "My Book Office" version, mum's partner just came back with one
1 TB Version is £80 at Amazon: http://www.amazon.co.uk/Western-Digital-MyBook-Office-External/dp/B001131L80