Isofix child seats

The belt and the isofix to the vehicle is my understanding.

7.1.1. Seat belt security
You must inspect anchorage points for:

all seat belts fitted
child seats and restraints that are securely attached to the vehicle using Isofix, carabiners, ratchet straps, nuts and bolts etc
disabled persons belts or wheelchairs
A seat belt anchorage ‘prescribed area’ includes the seat mounting points where a seat belt is attached to a seat frame.

7.1.2. Seat belt fitment and condition
You must check any visible parts of all seat belts fitted. This includes:

seat belts fitted to child seats and restraints
any disabled persons belts or wheelchairs straps