Its down to mileage.
Not always down to mileage.
I too have also made the decision to leave the scheme when my current lease expires.
My family’s farming business is placing an order for five new Land Rover Defenders for the managers of our tenanted-out farms, plus one for our head game keeper., So, I have taken the opportunity to ‘tag on’ an order for a Discovery Commercial HSE diesel/hybrid auto, having had one on loan for a month or so between our farms (plus, my brother-in-law has also gone all out for a Range Rover)! Basically, the dealer made us an offer we could hardly refuse.
Since taking early retirement from my day job at Defra late last year, I am spending more and more time on our farms nowadays. So, it makes sense to have a large diesel ‘proper’ 4×4 automatic, to get the wheelchair , plus a couple of ewes or tups in the boot when necessary! Also, to tow the livestock trailer to the mart, or the cattle crush or horse box around when needed. A Motability ‘baby 4×4’ vehicle is hardly suitable for some of these tasks and often our automatic 4×4 Isuzu pick-ups are in use elsewhere.
It will be sad to leave the relative ease and security of the scheme, but for me, like the OP, it is the way to go.