Cheers everyone for comments, Berns found me out. I bought the the toolbox book by Jim tolphin and it's got a great section on site boxes which gave me the idea for the wheeled one. The wheels are are off a pram and too small so I,ll put bigger ones on when I get the chance.
I'm mainly workshop based and don't usually keep tools in the van. these are easily loaded up and used when fitting on site and save me loads of time as everything I need is in just 2 storage boxes. Everyone should build a wooden tool box just to see how much more practical and easier to work out of they are compared to plastic. They also look much more professional and give the customer confidence in your abilitys.
The wheeled workbench is easy to move around, really sturdy, holds loads of fixings and tools, and saves me looking like a cowboy by working on there garden table! I'm soon adding a extension lead which is coiled and mount on one end, a small vice and some bench dogs.
Cheers