Just got the 'Mumsnet Swears By' email and one of the items recommended is Boden leggings. There us a direct link to buy them with 15% off plus free del and returns. Thought it might just be valid on the leggings but seems to be on everything. Not sure if you remove the leggings if it doesn't work though, if that makes sense? Still could order then, then send them back!!
The code is LNU5
Hope this helps someone.