Euro 4 phase out?

Does anyone know when or even if Euro 4 trucks are supposed to be phased out or can they just keep on using them with no upgrade until whenever??

I don’t think they get phased out, we’re still using a Euro 2 truck and Euro 3 truck, or do you mean will there be another change to the London LEZ that bans Euro 4?

Yep, hopefully never. Mine are both euro 3. Sort of glad it stops me going into London, even if I wanted to, ever since the government turned it into a theme park specially designed for trashy rich foreigners and media tossers.