I've not tried myself (despite the Jet A1 sticker on the filler cap of my Diesel car
), but have discussed this before with a few engine experts.
The concensus seems to be that if you have to, you can. But, that automotive Diesel engines rely for lubrication of moving parts (particularly fuel pumps) upon impurities that exist in DERV but not in JET-A1. The concensus is that if you want to routinely run a Diesel car on JET-A1, you need to introduce some lubricant - such as for example 2-stroke oil. Which luubricant would be best, and how much, has never been clearly established - at least not by me.
G