I believe you are talking about our forebears. FAC Tp (V) was in Cardiff, then Trowbridge before moving to Bath, where it was part of 21 Sigs, before rebadging to RA and NRHQ RA and being redesignated 255 (Somerset Yeomanry) TACP Battery, the rootinest, tootinest..er, oldest fighting unit in the West, with the entirely appropriate callsign of Vintage.
Edit. That’s not oldest in seniority of the unit, but in respect of the average age of the soldiers. Although to be fair, we’ve now got some people who are only in their 30’s.