I too spent many a happy hour crawling over the Southend Museum exhibits, albeit some years after Kolibear's exploits, when the Museum had officially opened in it's purpose built accomodation northwest of the 06 threshold.
Despite it's closure in 1983, many of the exhibits still survive elsewhere
Lincoln - believed to be in bits at Sandtoft (still no confirmed sightings!!)
Beverley (cockpit section) - Duxford
Anson - BAE Systems Manchester?
Saab J29 - Coventry
Harvard -RAF Museum Hendon
Sea Fury - Airworthy in US
DH Dragon - Science Museum Wroughton
Piaggio P166 - ditto
DH Drover - Lasham?
Javelin - Rimini
Meteor & Sea Hawk - Charlwood
CASA 1-11 Was North Weald, may now be US
B25 - derelict @ North Weald
Skeeter and SARO - IHM Weston-S-M
F105 - Manston/Cosford?
Westland Widgeon - Flixton