(16 Jul 2014, 6:54 pm)DaveyBowyer wrote What they could do is set a life span of 12 years with a mid life refurb at 6 - 7 years.
For the record, full sized single deckers (49xx/52xx/53xx fleet numbers) have a shell life of 15 years.
Midi/mini-sized single deckers have a shell life of 12 years (5xx,6xx,82xx/83xx fleet numbers).
A coach like that would have to have a shell life of at least 18 years.