Thanks answered my question was curious how it worked.

One last question as I'm also curious what's the break point for midibus / conventional.

For example hypothetically could they get a bunch of 10.8m Enviro 200 MMC's and downgrade the rotas for all new starters to save money. I believe the capacity difference is only 6 people anyway 40 vs 46.

(10.8m being the longest length for a SB120 which is definitely a midibus on paper at least).