In part:
Quote Originally Posted by ganulv View Post
A bit of a tangent, but some of the language in the interview (there was mention of the PEACE technique being used extensively in England and Wales) lead me to understand that policing policies are at least partly decided at the country level and not necessarily at the level of the UK as a whole. Is that indeed the case?
I don't know if the PEACE model is used in Northern Ireland and Scotland, both have different legal systems.

The model was used in my former department, I expect it is wider use in England & Wales, although it will not be a national policing decision, more acceptance of its value by each department (43 in Eng & Wales).

Your first question was:
Has there been a replacement with any particular standardized training regime and/or technique in general, and for suspects in particular?
There are specialist courses for interviewing, mainly for 'serious crime'. That was not my forte, so I cannot add more.