Thanks for the responses guys. Thus far Will is the first cab off the rank so Will, it's up to you.
I've put some pics on a Photobucket page at the following URL.
Replaced the 20t because I can't help myself try out bigger and faster mods for the 850. Have now installed an Owen Developments Hybrid TD04. The 20t was a alot of fun and really is a super little turbo. If there was any concern to be had it would be for those installing on old engines without strengthened bottom end. You may need to manage the way in which boost is applied. The 20t will hold 17psi without too much trouble and if the engine is loaded up early can come in quite quickly anywhere from 2800rpm upwards.