Just a suggestion for anyone going to Asda - I went to my local one this morning and had a look at the rollback toys. I saw the large Lego box mentioned on here apparently going for £25 - it was still marked at £49 on the main shelf. Walking around I saw another display of toys including the same Lego box but marked at £25. There was a Duplo box similarly marked higher on the main shelf compared with the other display. Probably not limited to these two but those are the ones I took note of.
So if you’re going to Asda for toys and think the shelf prices don’t actually seem much of bargain, it might actually be worth double checking the price with a member of staff.
(As an aside, I went to Asda looking for that Lego fish tank that has been mentioned on here - £18. My DD will be thrilled at Christmas!)