Just been into B&Q this morning and picked up some felt furniture glides with fixing pins. Available in the "Everything £1 section" near the tills.
Just £1 per pack of 12 which I thought was a really good price. I have been looking for something like this for a long time, up until now we just used self adhesive felt pads which move after time, where as these ones shouldnt move as they are fixed with a pin that you either push in or knock in with a hammer.
These are around 28mm (Approx 1" or so) in diameter & have a pin for fixing into wooden tables, chair legs, etc.
Sorry I dont have a direct URL / Link but they are in the £1 section of stores along with many other items like fuse packs, washers, cable tidys, cable ties etc along with many other useful items.