UK Police clearance

Anyone done police clearance from UK ?
I think we need it if we have stayed in UK for more than 6 months in last 10 years.

Please provide some idea about the timelines and things to take care. – It takes a month

Thanks @kapilchandra

One more question, the website says there is 2 day premium service for 85 pounds.
Do you know if 2 day is for actual verification process, or shipping ?
Would it help to pay the extra amount here?

Sorry Just seeing this now, I am sorry I didnt do so not sure