If you are stuck for Stocking Fillers for older children then you may want to consider Airfix Kits. They require concentration and are good for teaching the kids how to follow instructions. Amazon are offering 30% off Airfix Sets just now and you can pick them up for as little as £4.19.
You can have your Airfix Toy Bargains delivered for FREE if you have Amazon Prime or are spending £20 or more. If you are not wanting to spend as much as that and don't have Amazon Prime then delivery will cost you £3.30