Right, a bit of an update, but not much.
Basically the rear lip that has been on back order (as Honda UK don't keep stock and the warehouse in Belgium were out of stock) for over two months with Honda Japan hasn't arrived and won't in the near future. They contacted Honda UK to basically say they will not commit to a delivery date (after confirmed dates were broken on three occasions).
This has left me with one of two options, either leave my car at the garage until (apparently) mid to late January, or accept the car back with a new rear bumper but repaired lip (my original one that was hit).
Neither really filled me with any form of joy, and after some pushing I managed to get the guys insurance company to accept that they will receive two invoices from the garage. One for the temporary repair to get my car back, and then a second next year when the new lip finally arrives and then gets fitted in the repaired ones' place.
Best I can hope for at the moment it seems.
In regards to the exhaust, no news as of it yet. It was ordered on the 21st October with an ETA of 6-8 weeks but a hope of 4 weeks according to the importer. So watch this space.