Had full service two weeks ago, all fine. Car had MOT same garage, it failed on the anti roll bar as it split. He said it’s quite recent, my car is 8 years old. I’m ok with it, though I wander if the garage would have noticed any worsening parts of the anti toll bar during servicing. It will cost Me £96, though at least car will be safe.

Depends what you mean by "split". The bar itself splitting (probably unlikely) MIGHT be casually noticable. A rubber mounting being split less so, but either way I doubt a "full service" would include checking it,

I had an MOT fail for a roll bar mounting rusted solid on a Nissan Sunny, and it wasn't very noticable, requiring long pry-bar levering on a lift to be detected.

Cost me a lot of hammering to get it off. I replaced it with with one taken from an abandoned car, so a technical (but probably victimless) theft.

Come and get me, copper!

I don't think a 'full service' would include examining suspension bushes, even if it allegedly includes one of those 100-point checks. That is what the annual MoT should find, unless the owner has reported a knocking noise which requires investigation.