EGU*, EGV*, EGW* and EGX* and EGY* series seem to be UK mil.....I think?
Also EGO* (Valley, Mona, Woodvale, Shawbury etc). EGQ* (Lossie; Leuchars, Kinloss etc), and several EGD*
EGDA - Brawdy; EGDM - Boscombe Down; EGDC - Chivenor; EGDR - Culdrose; EGDK - Kemble;
EGDL - Lyneham; EGDY - Merryfield; EGDX - St. Athan; EGDG - St. Mawgan etc.