So here are a few pics as promised on the install. I haven't got the how to dismantle the the Horseshoe hosing or removing the old unit pictures as there are plenty of threads on this.
1) In summary though get the 2 VW style pins and pull out old stereo and remove wire clips
2) Remove the fascia and unscrew the HVAC unit and pull out.
3) Pull off the side panels from the horseshoe (pull apart by hand) and unclip the wires.
4) remove the 4 hex screws and pull out the unit to leave the gaping hole.
5) Pull off the side trim from the lower console each side and then the carpet covers and the front cover by the gear stick. All just pull off.
Once the old Horseshoe unit is out you need to trim this to fit the double DIN cage. Without Alex's equipment I used older school methods of a dremel cutting disc first as per the image and then filled it down to make it fit.
Test fitted the cage to make sure all was ok.
Next I had to secure this to the horseshoe housing. I did some research and as I couldn't be bothered to move everything round in my workshop to get the saws out for the aluminium as Alex did I lined it up and marked and drilled some 3mm holes through the horseshoe casing and used self tappers to secure the cage in which worked well enough
That was stage 1 complete and then onto the fitting of the head unit and wiring this in.
The existing wires from the stereo simply plugged into the adapter for the new head unit.
This then clips into the unit
I then connected the aerial adapter, GPS unit, USB Cables for the DAB+ radio which was everything I needed to connect to the existing wires
I then removed the lower console as it was only 4 torx screws and removed the existing panels. I was going to put the HVAC in the top slot but wasn't convinced of my plastic trimming skills so chickened out and went for the bottom unit where it just pushed into place with a bit of force. This then screws into the existing holes.
The cables simply pull through the passengers side from the old position and can be fed to the side of the side panel connectors rather than messing about feeding them through the other holes.
I decided that I wanted a USB in the top cubby hole for android auto, charging etc for my phone so with the top cubby hole I used am 18.5 mm circular drill bit through the middle and slipped the wire through then put the rubber cover back in and reclipped it.
The leads can then be connected to the back of the HVAC unit and this section refitted. I got the trim fascia from the OPC for about £5.00 part number 996.552.539.00. The USB cable is simple to feed back up to the top section for the stereo section to connect back into the back.
The next step was to put the Horseshoe section back in and reattached with the 4 torx screws and connect the lighter and controls on either side which clip back on and back in easily.
I then tested the unit the GPS worked fine under the dash so stuck it to the metal frame at the back if the head unit section and the dab aerial is in there at the moment too but haven't tested that yet so may get moved later.
I then slid the head unit in and with a bit of a push she was all done nearly.
Still filling down the connects 2 fascia panel which is taking some time but will get there eventually.
Hopefully this will be of some assistance to others alongside things such as Alex excellent write ups and all in all was pretty easy to do.