This may be a glitch as they aren't toys but I'm sure it will help someone. Some of the kids single duvet cover sets have been reduced by 20% and then they are also attracting the toys 3 for 2 offer. I don't think they have ever including bedding before and it's only certain sets and characters not all so play around and see what you can get.
For example I added 3 paw patrol single duvet sets they were £13.99 now 20% off at £11.19 then add 3 to trolley and they come to £22.38 plus you get a free Nickolodeon scratch card too!
One's I know that are working are (All single sizes)
Trolls - £10.49
Marvel Avengers Shield - £10.79
My little pony equestrian - £11.19
Disney Princes Boulevard - £11.19
Paw Patrol Pawesome - £11.19
Peppa Pig Puddles Rotary - £11.19
Disney Frozen Lights - £11.69
Star Wars The Force Awakens - £15.99
There may be others but wanted to get this out fast