Went into Asda Walmart superstore today near Waterlooville and they had quite a number of lego sets half price.
Lego Superman 76009 (RRP £20) for £9 - several sets left on top shelf
Lego Cargo Heliplane 60021 (RRP £35) for £15 - again some sets left on top shelf
Lego Hobbit Mirkwood Spiders (RRP £25) for £12 - lots of sets
Also a ninjago set Coles driller for under half price (I think it was £12 reduced from £25) and a couple of Chima sets reduced.
The stickers were not clearance, but looked like national price reduction. Hope this helps someone.