Ask an Property Solicitor. Get an Answer ASAP.
If you are private individuals doing this, you do not have to register with the Information Commissioner although you are still bound by the basic Data Protection principles.
There is no reason why you should not register with the information Commissioner but it is not required because of the size of your little organisation and what you are doing.
There is no harm in getting everyone to agree though.
If you could please rate my service five stars (even if it’s not the answer you wanted) that would be really helpful. If you have any further questions you want to ask on this subject, I am happy to deal with those for you.
Hello again. Can I assist you any further with this?
If not, if you could use the rating service, it helps me greatly because it gets me paid and it doesn’t cost you anything. Thank you