(10 Jan 2022, 11:11 am)Rob44 wrote 100% agee with this.  It would be hardly an option to say that every but in england need to meet the require standard by xxx date. so start in the worst place which include Newcastle. Now if SCNE and other want to move there buses around then that really a matter for them and as Ian says if stockten/5under1and get them and there quality decreases they will get new buses and the buses they received will be moved onto another area i would guess and so forth.  Not ideal by any means...

You also have to remember that there isn't the finance or the manufacturing capability to carry out a mass switch-over to Euro 6 vehicles - if it was enforced, we'd be seeing operators decide which were the most profitable routes to keep and everything else would get binned.  Not exactly the best way to encourage bus travel!  Hence the bit-by-bit approach.  Eventually there may come a time when the switch can be mandated, but that won't be until the majority of vehicles already meet the regulations and they just need to encourage the last few across the line.