Is Windows phone 8.1 update 1 available for Nokia 1520 from Vodaphone in the UK?

[Windows Central Question]

Is Windows phone 8.1 update 1 available for Nokia 1520 from Vodaphone in the UK

I need to upgrade my phone to GDR 1 update 1 (or Cyan Update) in order to be able to connect using L2TP.
My phone is automatically updated so I am wondering when this update is due to be roled out in the UK for Vodaphone users.