.....van dream has gradually turned into a reality and now a scary decision (and debate with the wife!).
I've been looking all summer (all the hours spend on fb, autotrader.co.uk, ebay) but only started viewings in October. ..... I admit we are really keen to buy something now, but maybe need to take it slower.
Been there done that! We took the plunge in March this year after what sounds like a very similar process to your own. We started actually viewing vehicles in December (after plenty of online research), so first of all I would say if you only started viewing this month - take your time! Other options will become available.
We started with a 2016 on around 35k miles, then checked out a 2018 with ~30K, then a 2020 with ~20K, gradually stretching the budget further and further. It became obvious to us pretty quickly that our preference was for newer / lower mileage, and a reputable converter, so based purely on that I would go for your option B. But I think the LV package is reflected in the price. I would be looking for a T6.1 Highline base, 2020 onwards and with much lower mileage and preferably some kind of warranty. I just did
a quick search on AT and found this, for less than option B. Obviously too far away for you, but since you're willing to travel 4 hours, I'm sure other options will come up. (We almost traveled from Merseyside to Devon to view one, but waited - and eventually found ours only an hour or so away)
SWB, Euro 6, particularly RIB bed narrows it down A LOT but we both agree that's important for comfort and storage
We had a similar "must have" list, which narrowed the search down too. We were insistent on the RIB bed, and also a single front passenger seat - we were quoted around £1500 by a couple of sources for swapping out a double. An awning can be added later (or better imo, an awning rail for ~£200-£300 plus a sail awning like the Debus), as can roof bars etc. Expect to fork out probably into 4 figures for bits and pieces to kit your van out anyway, as others here will no doubt testify to, so it's important not to stretch your budget to the absolute limit - but I'd still try for newer / lower mileage if you can.
We also swapped our car for the van as our daily, so SWB suits us (a LWB would stick it's nose out of our driveway!)