No one used vans for personal use at my former depot. Occasionally a supervisor or on call bod took one home if they expected to work or get called out. Vans sometimes got allocated to personnel travelling to courses. Company cars were used for personal use, of which there were...two. One of which was even being turned into a pool car. All the work vans became pool vans, and numbers slashed to the point there wasn't enough vans for work days.
Believe me, Network Rail is getting slashed to pieces at the maintenance level. There's no gratuitous use of company assets for personal use, no lavish wastes of money; there are no assets, and there is no money. Soon there will be nobody left to spend what little money there is at the bottom of the moth eaten maintenance wallet.