I live within spitting distance from the coast, North Gower over looking an estuary. We usually have all sorts of aircraft mainly Tornados and Hercules using it as a training ground (low flying around 150 metres ect...). Just heard what was a rather loud flyby so rushed to the window to have a look, maybe 200-300 metres high flying slowly up the estuary was a rather slick looking aircraft with twin tails like the ones you find on the F-15 or mig. I just checked on RAF website and we don't operate any aircraft like that. Are the Russians getting itchy again. Hopefully American!