Thank you for your reply I have received my new contract for the next 18 months "Ultimate Volt" which I negotiated and I am happy with the Virgin Media side of the package.
As o2 is part of this package and I have had unlimited sim £25 for 16 months previous, I will be paying after RPI increase £32.15 for the sim does the "Ulitimate Volt" package allow me to downgrade to a cheaper tariff with o2?
Thank you for your help
You can by uswitch.com - as part of the checkout (which is O2 based) you can login to your O2 account when asked, and select the option for not requiring a new SIM sent by post. In the checkout it normally states VOLT details. Many people on here done that to change tariff. Your O2 contract will restart for 12 months from the date you do the change, and VOLT won't apply on your O2 SIM until 7-14 days have passed, then the system kicks i again and VOLTS your data up and travel roaming. Remember if you change before April, you'll still get the 2023 price increase apply - do after and you'll likely get the normal tariff rate unless O2 decide from that date they've all increased too (historically they haven't past few years).
Hope that helps. Technically, lowering the tariff is not what was originally agreed, but many people commented on the forums it was not blocked. I suppose the benefit is that your contract minimum term is restarted for O2.