Nimbus
Hap,
The problem appears to be a political one in that the "Folk and Transport" Museam is dominated with people whose interests are not in aviation.
Apparantly they were offered a Sea Vixen at one time as the squadron it served with had the "Red Hand of Ulster" as it's squadron badge. However it was declined as it was thought that with this badge ot would attract the IRA to the collection and jepordize a jaunting car or two.
They were not prepared to paint out the badge untill a more favourable political situation or was it an excuse to avoid expanding the aviation side. Sea Vixens were maintained at Sydenham for a long time so there was a local connection.