Basil Jet wrote:

Unfortunately they've used Gill Sans rather than Johnson,
making the memorial a bit crapper than it should have been. This is in
Chester-Le-Street in Co Durham.

https://www.instagram.com/p/BXNZOkxjuev/

Would they be allowed to use Johnston (not Johnson)? TfL owns the
copyright, and I think it controls the font's use very tightly.