How would meritocracy work, rather than seniority, when (presumably) RT/PCs are being passed to company standard?
A points based system that can include sickness/absence, LIFO, qualifications (and even potential qualifications) and almost anything else the employer sees fit to use.
Unless you have a very strong TU or a very good relationship with the employer you have no say and if your face doesn't fit they can and will find a way to get rid of you.
Sorry but that is how it is these day. Seen it happen this year.
Good luck to all involved.