Not a question I'll be able to answer, but as a clarifying question, when you say "territorial units," do you mean as in regiments/units associated with a particular location like the Scots Guards and the King's Own Yorkshire Light Infantry, etc., or do you mean in the technical sense of the British "territorial army"?

The latter is the term that the British use for reserve units. If you mean the former I suspect this question might be confusing to anyone more familiar with the technical usage.