From what I’ve seen the 7p rate was effective from 1/7 so I would guess that would be the active date for that rate. It would be OVO detail rather than Ohme which would be relevant. 
Presumably you’ve been through the compatibility check before signing up. But there’s also often a short delay after switching OVO (you don’t say when you switched).

Help page here 

thank you for your reply

i did do the compatibility check and everything was ok, i switched to OVO on 26/07 and applied Charge Anytime to my account today, 01/08 which is showing active on my account now on the EV hub.

just got a confirmation email from OVO stating my Charge Anytime is active at 7p/kWh so i think i just panicked when i saw 10p/kWh when setting up my Ohme charger to my account

so yes, you are correct, it is the OVO detail not Ohme that is relevant, thank you for your help, i’ve calmed down now 

Pop back if you have any further questions @thecakemuncher