Just been to Homebase in Peel Retail Park, Washington they have 20% off Dulux Mix Paints - I got 2.5L for £17.99
£24.99 - 20% =19.99 then 10% = £17.99
Sounds good to me!!
Sorry - Don't know how long the offer is on for or if it's nationwide but there was a notice next to the Dulux Mixing machine. Hope this helps someone!!