The England Netball website also has a lot of information about different aspects of Officiating, so their page is worth exploring.
England Netball Officiating Page
County Netball Association Websites and Social Media
Essex Met Umpiring
http://essexmet.co.uk/club-area/officiating/?
https://www.facebook.com/EssexMet/
https://twitter.com/EssexMet
Kent Umpiring
http://www.kentnetball.co.uk/umpiring-courses
https://www.facebook.com/Kent-Netball-Association-1522404298022673/
https://twitter.com/KentNetball
Middlesex Umpiring
http://www.middlesexnetball.co.uk/mcna/index.cfm/umpiring/
https://www.facebook.com/middlesexnetball/
https://twitter.com/Middx_Netball
Surrey
http://www.surreynetball.co.uk/officiating.html
https://www.facebook.com/surrey.netballdevelopmentofficer
https://twitter.com/SurreyNetball
Rule Books
The 2020 edition of the Rules Book is available from the England Netball Shop
https://www.englandnetballstore.co.uk/
New Rules Books can also be obtained from your local County Umpiring Secretary at a reduced rate of £4.50 each. For more details, please contact your County Umpiring Secretary.
Downloadable Rules Books
The 2018 edition of the Rules Book can be downloaded from this link and can be saved to iBooks on iPhones and iPads or Pocket on Android… However, nothing beats having the real thing in your pocket!
International Rules of Netball 2018 edition