It seems your opinions are about 5 years out of date there as there standards are alot higher and i actually think the coaches are better than Nat Ex as Quite a few of Trathens vehicles are internally revolting. i saw excrement on a curtain on a Nat Ex Neoplan
Megabus is real mix of old and new, much of the fleet is made up of former National Express Volvo B10M/Expressliners from when Stagecoach worked NatEx,
Wrong its Mostly Joncks,Neoplans and Newbuild Plaxtons with the majority being bought this side of the Millenium
Neoplan Skyliners displaced from Oxford Tube duties
Wrong No Skyliners have been displaced from Oxford Tube a Buchan Link/Megabus Spare is actually on loan to Oxford Tube
and tri-axle Volvo Olympian/Alexander R types repatriated from when Stagecoach had Hong Kong CityBus.
Wrong Only 1 Olympian regularly works in Service and thats a South West trains liveried one (Leeds-Portsmouth Service Only) and thats only as a stop gap measure. More Plaxton Coaches are due probably to replace Joncks
Brand New coaches are Common except on services that don't serve London or Services to Liverpool Figure that one out for yourselves lol
There is also Megabusplus which combines Megabus and Megatrain so that the coaches connect onto EMT Train services, and there are also Megatrain services on Virgin SWT and EMT Services.