Mattdean, Getting this Thread back on subject, I would advise doing a forum search on Southend as there are a lot of Forumites with a connection to, or affection for Southend Airport and the old Museum.
My Grandfather worked there up until the Collapse of Channel Airways in the early ’70s, and I have happy memories of being taken out to the hangars around the back to see him at work.
Good luck with your endeavours, and if you have any thoughts or queries, or are ever unsure about what you have been told, post it on here, 2 or three people will have thorough, but differing answers for you! 😀