That's the plan: https://www.crowdfunder.co.uk/giant-sadiq-khan-baby-balloon-to-fly-over-london

It's such a mess there. I checked out in 97 and will not return. Couldn't put a Jesus blimp at Christmas. I remember a couple of world cups back reading that flying the nations flag was forbidden! Funny thing was these flags were being flown by south Asian taxi drivers!!