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My husband used to drive a large vehicle, 7.5 tonnes for a living, albeit many years ago. We have rented many very large motorhomes in the USA, where motorhomes are really very large. A while ago admittedly, but he still has the capability to manage a vehicle in the region of 4 ish tonnes.
The reason he let it expire, wasn't because he didn't feel happy driving anything large once he reached 70, was because he didn't think we'd be having the opportunity to driving anything large in the future. It involved a medical, and having to send in the licence to DVLA rather than doing it online. Also, at the time, we were due to take a trip to europe, where we were renting a car so needed to have the actual licence. He didn't want to risk it not coming back in time.
I think it was more a case of can't be bothered to do this, I won't need it again. I know quite a few 70+ year olds who have done this, and later on regretted it as the need/opportunity to driving something bigger has cropped up.
D4 drivers have been very helpful so far, I have managed to do a live chat, and the information we gave made them think he'd not have any issue getting it back, it's just that DVLA are so very behind. They are concentrating on getting licences back to people who need them for their jobs, which is quite right. We shall see, nothing at all to lose. Well £55 for the medical, but he'll get it back eventually, and the owner of the motorhome has said we can have use of it anytime so there'll be another chance.