Apologies if this has been done before, but which are the biggest unstaffed or smallest staffed stations on the UK network. Size can be in usage, number of services or number of platforms.
I'd guess that the biggest unstaffed station on the network is Wakefield Kirkgate, and that the smallest staffed is somewhere rural like Kyle or Llandrindod.
(Wikipedia usage figures alert

)
Hounslow Loop has 4 out of 7 stations unstaffed, and 2 had usage of more than 1 million in 2013-14:
Kew Bridge: 1.181 million
Isleworth: 1.152 million
Syon Lane doesn't have 2013-14 figures shown, but 2012-2013 figures are 0.975 million so the 1 million mark has probably been reached there as well.
Syon Lane does not have any obvious sign of disused station buildings being in existence (well, on the road it is named after anyway), however Isleworth's building is completely boarded up, and at Kew Bridge only a very small part of the building is occupied by a local business with the rest boarded up (although I haven't passed it by road for a very long time now

). At the remaining unstaffed station, Barnes Bridge, the single-storey building is occupied by a local business.