Currently obviously London but then it’s Bath & Birmingham, Portsmouth next then yes I believe it will spread like crazy.
Depends on yr work & where you go, but unlike vans at £8 to £12.50 a day so not a big deal especially if you don’t go in them daily, for an HGV it’s from £100 to an 05 reg I’ve just sold at £300 a day for London its quite an impact, you might think you’ll be OK for a couple of years & if the price is much lower to purchase it might be worth the risk for an non euro 6.
On the little ones I run it’s quite a jump from euro 5 to 6 prices used, I think it’s similar for bigger stuff, but obviously that resale value for euro 5s & especially older will get even less as time goes on.
I don’t see in the short term say 3 yrs, that regular motorways & A roads will be going ulez, but who knows!