In article ,
Colin Rosenstiel writes
The 1990s unitaries were made to fit in with post-1972 local government
legislation which didn't include County Boroughs. They are essentially the
same though modern unitaries are not the same as the old County Boroughs
in a number of respects. Peterborough shares a number of services with
Cambridgeshire including the Fire and Rescue service, Police, Waste
Disposal arrangements, structure plan and a Lord Lieutenant.
The old county borough sometimes shared functions with the counties
around them, too.

Smethwick, a county borough since 1907, shared a police force with
Staffordshire pre 1966. Solihull and Warwickshire shared a children's
home during Solihull's brief period as a County Borough (1966-74) and I
think that Brighton and the two Sussexes shared a common police force,
too (but I might be wrong on that one).

They *all* shared Lords Lieutenant, since that was (and is) an office
pertaining to the geographical (now "ceremonial" county, rather than the
administrative one. Even Birmingham was ultimately under the Lord
Lieutenant of Warwickshire and Manchester under Lancashire, although
they were obviously self governing in all respects.
--
Ian Jelf, MITG, Birmingham, UK
Registered "Blue Badge" Tourist Guide for
London & the Heart of England
http://www.bluebadge.demon.co.uk