Was involved in near miss during a red arrows display near Bristol. RN Merlin carrying full pasenger load flies through restricted air space during arrows display. Apparently red one had tried several times to contact merlin on radio so broadcast on emergency frequency. Next thing nine red hawks fly straight infront of merlin in formation resulting in evasive maneuveur. needless to say everyone in the back needed new underwear and a rather large pineapple was concealed in one of the flight commanders cavities.