So I’ve just found the first sentry F2’s in the UK I think! I was going to film a siren test at Valero oil terminals in Kingsbury and I found a total of 4 sirens! Two of them are sentry F2s and another 2 are some random grey sirens. (52.5770368, -1.6693948) Sentry f2 (52.5770368, -1.6706256) Sentry...