I had a look on http://www.uk-buses.co.uk/fleetlists/stagecoach.php and entered Slatyford. This site shows the Euro status.
I also entered a few registrations into the gov site for checking the emissions zones.
27250 SN65OCL ADL E300 is Euro 5 and incurs nil penalty charge so ok for all UK low emission zones. This is a regular on 685.
Check 24121 MAN E300 ex Carlisle is Euro 6 and incurs a penalty charge.
Checked a 58 reg E400 euro 5 and nil charge yet a 57 E400 euro 5 incurs a penalty charge.
Maybe some if the euro data on ukbuses is not up-to-date and maybe the DVLA has not caught up with 24121 being re- engined to euro 6.
So maybe not simply a case of all buses must be euro 6.
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