I've read that you can put the mid display unit in the glovebox after a stereo upgrade, anyone done this, or any instructions how to

It depends on your starting point if you have the basic Business radio set up there will be a large quadloc connector behind the radio with a small spur to the mid these need extending so the Mid can be moved to the glove box.

If however you have the screen and Nav up front then the Quadloc is in the boot under the spare wheel you will need an extension to conect your new Head unit to the speakers power etc. I downloaded pinout drawings from the internet for the mid and the quadloc in the boot then used some of the redundant head unit wiring to connect the mid 

I will see if I can find the pinouts for you

I've got the basic business, I've already connected a stereo, but having display issues so thought I'd put it back in, will both cables need fitting or just the little one as main one is fitted in new stereo

 

The display isues you speak of are they with the new head unit or the OBC functions in the binacle between the rev counter and speedo. If your putting the mid back it's the little one that goes to the mid, it needs extending so it will reach the glove box feed it through and plug the mid back in you should then be able to reset the time/date and the other functions will be back in the binacle. 

 

Thanks, I'll give it a go on the weekend