Probably more aimed at business sellers as you need to order 3 or more boxes to the same place.
Basically its £5.99 + £10 collection charge and vat.
As you can see it becomes more worthwhile the more you order as there is only 1 x £10 charge. I presume however there would be nothing to stop you filling a van at £5.99 a box.
I was going to use a pallet but as you can see below for 10 boxes it comes to £83.88 and you have the piece of mind they will be delivered first thing in the morning. The only others in this price area are Yodel
5 x 24kg boxes http://oi60.tinypic.com/23mx6xc.jpg
10 x 24kg boxes http://oi62.tinypic.com/1ze9gs7.jpg
Feel free to respond but remember this is a premium, guaranteed am delivery before you go comparing to inferior services.