RE: New StreetDecks & ADL Enviro400s - X-lines fleet changes
Once all the new double-deckers have entered service, and the departing route X1 Volvo B9TLs have been refurbished, I doubt there will be may double-deckers older than the 62-reg ex-London Volvo B9TLs left in service. Only a few ex-Brighton Scania OmniDekkas as far as I can tell.