Just updating this for anyone who comes along and is trying to do something similar in future.
Ended up collecting these doors myself so that I would be able to collect them on a small flat bed/dropside cab, and keep them on there until I got enough bodies together on the Saturday. They came fixed vertically on a pallet so lots of strapping over the top and over the pallet and a nervous, but thankfully uneventful journey back along the motorway and into the driveway. I built a temporary 'pier' of sorts on the steps you can see in the first picture using block, and had the flatbed reversed up against this so it was a more or less level shunt from the truck to the ground level at the front of the house. This was the most difficult part.
Had 4 guys, and had planned to roll it around on pipes, but what I found was that while the pipes were fine when I tested for the weight they could carry with a plank of wood and bags of concrete, that worked well because of the low centre of gravity. Moving a door that is 230kg and over 2m tall the pipes just made it unstable and liable to tip from the top, and so ended up chucking the pipes and dragging around, with the packing piece under the alu threshold in contact with and flat on the ground.
On install started with levers and jack but again abandoned these for basic grunt and lifting each end a little at a time and placing blocks under until the door was more or less level with the opening. Fortunately the doors were supplied with nylon handles/loops screwed to the side and I used a couple of glass suckers for extra lifting points for the final lift into place. I found that 4 guys were enough to lift short distances, any more would have been too crowded and any less would have been a struggle. I found I was able to lift one end off the ground an inch maybe on my own, and 2 could therefore lift into place, but where you really need extra bodies is to keep the top from tipping. Once in I held in place from the top with some temporary brackets so that I could let everyone off and I was able to shunt adjust the final level myself before putting the screws in, and now just the finish left.
So, 240kg, 3x2 metres, do-able with 4 guys, but I wouldn't be rushing to do this again in a hurry!