[Talk-GB] Multiple nodes for Sheffield

[SomeoneElse]

Over the weekend I spotted that Sheffield seems to have been added twice 
recently:

http://www.openstreetmap.org/browse/node/2510041800
and
http://www.openstreetmap.org/browse/node/2494466157


as both are recent edits, I presume that both were added in good faith, 
possibly almost in parallel.  However, should either of them be here at all?

http://www.openstreetmap.org/browse/relation/106956
has
http://www.openstreetmap.org/browse/node/266155142/history

as a member, but that's been "name = Sheffield City Centre" for a couple 
of years.

What's the "correct" way to set up admin boundaries and city centres so 
that neither humans nor nominatim are confused?

Cheers,
Andy