Halfords Redditch was full of major 'clearance' reductions this week on bike and other stuff.
By way of example I bought a very nicely made lightweight cycle pannier rack for £5 (no claimed original price but similar items are typically £30 - £40, more for a fancy brand). A traditional steel rack with spring loaded luggage clamp was £2.50 and they had lots.
Plenty of one off items, including audio, sat nav, etc also very cheap (most probably ex-display).
I can't say for sure whether this will be national but I guess it will be where stocks exist. Maybe not worth a special trip but have a look if you're passing.