Good luck, hope it goes well.

I forgot to mention, but as we'd already had our old radiators removed, in preparation I went round beforehand and painted the walls (as you can never paint behind radiators), and then wrote on the wall in pencil the size of the radiator to be fitted, as they did manage to mix up a couple radiators when placing them in the rooms ready to be fitted (easily done!). I then double-checked each radiator was in the correct room before they got to fitting them.

Posted by: @sheriff-fatman

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Today's the start of the installation and, having spent a bit of time around the installation team, I'm feeling quite relaxed about things.  They turned up at 7:30am and got their heads down.  The more senior guy has been fitting heat pumps as his primary work for the last 7 years, and clearly knows what he's talking about.  The main team is two guys, and we've had a labourer turn up for a period of time.  They've spoken to the electrician, who's coming out tomorrow, to provide info on what's available for him to use on the fuse board.  I've heard them describe it as a "nice job" so far, so they've clearly not seen anything to give them concerns.  They also seem quite confident that they'll get finished within the two days, so we'll see if that's the case.

Radiators, heat pump and cylinder have all been delivered this morning (they're half expecting something to be missing/incorrect from the radiator list, which seems to be a fairly standard occurrence, but no indication of this as yet, and clearly something they're used to).  I'm currently staring at a monster of a K3 that's going in the kitchen/dining area, and have watched them carry through radiators to go into the upstairs rooms.

So far so good (touch wood!)  First impressions only, but I've gained a huge amount of reassurance already from having seen the guys go about their work, and from the interactions I've had with them while trying to keep out of their way.

Good luck.  Missing rads definitely was a problem for me.  The fancoil was supposedly on 3 month delivery (but actually turned up 4 days later!) and the delivery guys managed to drop one of the rads en route.  As a result the installation was finally finished about a week later, but was usable in the interim.

It sounds from your description like you have a good team, but I wish you good luck anyway.  If you see anything suspect, question it.  I did ask my installer (who I rated) a few questions as he went along, he pushed back, with reason, on a couple, but conceded those where he had indeed forgotten something.  

There's one radiator not within the delivery, but this has been sorted now and is arriving tomorrow.  In fairness, it's one that was a late request by myself to change from the original design as the wall in the conservatory where the existing one hangs from won't be there when the conservatory upgrade is done (it's where the 'external doors and windows' leading into the conservatory are located).  Getting a new radiator onto a wall that won't be affected by the conservatory upgrade is an optimal piece of future-proofing for us to do now, and the fact that this was the missing radiator makes some sort of sense.

So far, so good.  It looks like I short-changed the team's experience in the description.  The least experienced guy has been doing heat pumps for 7 years.  The older guy has been fitting them for 12 years.  It's the only type of work they do currently and they've installed cascade systems, ground source pumps, etc, so I doubt that ours will prove too much of a challenge for them, by comparison.