Did not Devon and Tumby operate simultaneously and independently of each other, certainly from 67 until at least 73?
I don't know, there was certainly a detachment at Dunkeswell in the early 70's. Apart from the bombing comps., there was a fairly lengthy ecm trial conducted that utilised the RBSU.
The one that I am interested in, Bishopbriggs, was probably gone by the time the Mk2s came into service.
YS