John G wrote:Just checked out the site mention above - bit expensive. I worked out a basic mug box and it came in at 66p each

Your best off going to your local diecutters and buy from a range of stock boxes - much cheaper.
For standard mug boxes, it's better just to buy from your usual suppliers. I couldn't find anyone that sold boxes suitable for El Grande mugs or 8" plates, nor could I find suitable stock boxes from other sources that would suit shipping these items. I'm not aware of a die cutter local to me.
The double-walled boxes made by ASC are not only the exact size I need (because I measured before ordering) but they also survive shipping. I put one of my 8" plates in the first box I got and, without any additional packing (like bubble wrap), we tossed it around, hurled it at concrete ground, slung it the length of the garden, and the plate survived with no damage. And I don't need to buy more than 25 at a time if the product isn't a big seller. I considered 66p to be a reasonable price for all these advantages.
Of course, it'd be better if some supplier of oddball-sized mugs and plates bought boxes in bulk and sold them to us customers, or if the manufacturer of the items supplied them in mailing boxes, but that's not going to happen.