Have got DC aged 5, 6 and 6. I have a budget of £33, so £11 each. Have found some really good craft kits for £30, and then could do token under the tree gifts for £1 each or so (which equals a 99p hat/glove set, some crayons for 20p, a mini paint set for 40p, and a charity shopmbook, there are cheap stories for 40p and less in our local?) each. They will have stockings too, and I really love and think they will love the craft set...and their similarities in age and preferences means a shared present could work well? It would mean a big box which they would unpack together, with masks and stuff to make and activites to do.
Alternatively, any cheap (£11/under) craft or activity based gifts suitable for 5/6yos, so they could get individual presents?