Breakdowns on them ADLs now is inevitable, they’ve probably covered a good few million miles & anything would struggle with that (granted maintenance could be better yes).
Another thing to remember is the places the 110 goes through, Birmingham City & the expressway, Erdington, Sutton, Bassets Pole are all absolutely terrible places with traffic, plus between Sutton & Erdington it’s 99.9% guaranteed you will stop at every single stop & pick a few passengers up..
but with Tamworth shifts drivers only do 110s (minus a few late shifts) but they do often do 2 return trips to Birmingham & recovery time is slim to none.
yeah they’ve been decent workhorses.. Jesus it does make you wonder if they’ll ever resurface Siddals.. it’s been that way since I was a kid