there are two basic things to consider ,when it comes to the drone flying regulations ,one is the operator ID ,and that is a requirement to register the person who owns the drone with the CAA so in the event that a report is submitted to them then they are able to know who the drone belongs too
this has a bearing ,if the owner knowingly allowed the person in charge of the drone ,to fly the drone without a flyer ID ,so the flyer ID is linked to the pilots qualifications not the operators ,you can own a whole stable of drones without ever having flown one ,so if you let someone else fly your drone, make sure they have a flyer ID before you do so