I followed your suggestions and it went well initially, with the new
Creative Cloud allowing me to reinstall both Photoshop CC and Bridge CC.
However, in the Programs/Adobe folder it is still the corrupted original
files for Bridge that show, dated 3 weeks ago, and I am still unable to
access Bridge from desktop or Photoshop CC.
I shall try again later when I have more time, this time removing any
remaining Bridge files manually after reinstalling CC, then rebooting
before installing Bridge.