Jim and I found out today what was causing the leak.
Due to the S2 wiring loom going over the top of the heater matrix and being such an unflexible PITA, the lack of room had meant the plastic pipe unit that can be unbolted from the matrix had been nicked, and part of the broken plastic got stuck between the mating faces leaving a gap.
Remember, we'd unbolted that section from the old matrix, removed the matrix and slotted in the new one.
To make things "easier" we thought it would be best to remove the pipes on the engine side, although we took "remove" a bit too far.
They would not budge so we had to use a pry bar, which actually worked out safer.
After getting the car up to temperature and pressure, we used one pry bar to operated the retaining lever, and the other longer pry bar to work the pipes off.
There was a sudden and almighty squirt of steaming water, which if we'd been closer with our hands would have probably scalded us!
Unfortunately, it wasn't from the pipes coming free, but from the rubber inlet pipe splitting from the plastic union.
Jim shocked me as he said a rude word.
We eventually managed to get the union apart and saw there was quite a bit of limescale which was causing it to grip. There was also a large crack in it from forcing it free, so it was totally dead.
Thankfully, Jim had a spare, and a pair of straight connectors which, thanks to the new matrix arriving from GSF early this morning, he hadn't had a chance to fit to his V6, replacing the copper pipe connector that we'd fitted.
So he set about measuring carefully, and fitted the replacement.
We tested and it remained bone dry.
Everything's gone back together, except we're missing 1 bolt and the 10mm deep socket I bought yesterday, there's no misting, and loads of heat
While we were working on the car, the exhaust parts we'd ordered from
www.onlineautomotive.co.uk arrived all nicely vacuum packed together.
Now we'd ordered them on Tuesday, hoping to be able to pop up and get them. I spoke to a very helpful chap called Ash, who said that Jim's parts weren't in stock, but they might be able to get them in for the next day.
I asked in that case if they could deliver them to Jim's, and Ash said to leave it with him, he'd call me back.
30 minutes later he did, and said they can get them delivered for free (giving us a £15 discount) for Friday.
Excellent service and a good price too!
Anyway, as Jim left this evening, I thought I'd set about fitting the new middle silencer.
I took the old one off and compared it with the new one.
Not good, the new one was shorter and was flared at both ends. Not only that, it was a larger diameter!
I double checked the order and realised that Jim and I had mixed up middle silencers, so dashed over to his to correct the mistake

Once home, I compared silencers and the new one is a couple of inches longer than the old which is perfect!
So tomorrow (while Danielle is busy gardening for charity) I will fit the new middle silencer and fingers crossed the back box will fit too!