Stats on the Nominet website:
http://www.nominet.org.uk/intellige...s/registration/
There is an excellent forum for .UK (google acorndomains) - mods, delete this if outward promo of other forums is not allowed.
There is currently a 'paper' form that needs filling in to complete a transfer, however scanned +emailed copies are accepted. The online systems are due to go full online including transfer at some point as Nominet now uses EPP.
There is good money in .UK ,
www.domanprices.co.uk has public data, and a browse of the top keywords will give you a good example of age / coverage.
There are a couple of UK parking companies such as Streamic , Sedo now have a UK office etc.