I can put my hands up to this one.
XJ580/131 was purchased by Troika Developments Ltd from Flight Refuelling after being used by them, and donated to the Sea Vixen Society, of which I was on the committee for several years. Yes it was in a sad state. It had been regularly vandalised, as it was in a public place with no security. In fact the yobbos had somehow managed to smash the front screen - not an easy task. This of course led to water entering the cockpit area and making a heck of a mess. We were only a small society and did not have sufficient funding for the upkeep, although we did consider getting a Lottery grant.
In the end disposal was seen as the best solution to preserve the Vixen. It was dismantled and transferred to Tangmere Military Aviation Museum in 2000, where it is now on display fully repainted and looking great.