As stated in my previous reply, overview and scrutiny committees (OSCs) have powers set out in the Local Government Act 2000 to co-opt non-voting members onto OSCs. These co-opted members can be:
a member of a committee of the county council or another local authority, for the purposes of relevant functions of the committee in relation to the county council; or
a member of a committee of the county council, for the purposes of relevant functions of the committee in relation to another local authority.
Therefore, hon. Members cannot be co-opted onto an OSC.