If we have morphed into old aircraft, - I recall that Biggin Hill airfield had a spit and/or a huuricane at the entrance - don't know if they were real ones or fibre glass, full size replicas - haven't been there for a few years so they may have gone.
Ford airfield near Littlehampton, (now used for car boots and markets), still has an old, paint faded, Hawker Hunter at the entrance - was still there a few months ago, when I drove past.
Further to the subject of strings, I remember that, when I used to gig, I kept a cloth in the guitar case and used to wipe the underside of the strings, before putting the guitar away. It was the underside of the string where any sweat and dirt used to gather. About every 6 months it was necessary to clean the frets with an old toothbrush or cocktail stick, to remove any grime which tended to collect in the fret slots. Nowdays they hardly get dirty and just need the odd polish and wipe over as required.
Kindest regards,
Christopher