Don't know if it's nationwide. Just spent £5 on approx 25 items.
In the above picture, the £2.50rrp is a sale price of its own so real rrp more. Same on other items. For example one label said £0.03p rrp £0.75p, and a look on the shelf said £0.75p rrp £2.50 so in reality it was £0.03p rrp £2.50