Data protection act.

[Fluffycloudland77]

I work as a visiting professional, a company I visit has given my mobile number to a clients relative so they can arrange a home visit.

I don’t do home visits. They know this as I’ve refused before.

I have never said they can share my mobile number. Have they broken the data protection act?.

Yep - unless you’ve given your consent!

i work in data protection. It probably is. You didn't give your consent.

Is it a work mobile which is publicly available on a website or on and email signature or your personal mobile?

Who pays for the mobile? If it's you there is probably a non-criminal breach of data protection law.
If it's them or you get some money from them to run the phone , it is less clear.

It’s a personal mobile I take work calls on. It’s not on receipts or a website.

I am considering being contactable by email only.

Yes. That's a breach. And reportable.
It depends on what redress you would like as to how you proceed.

Report it then block the number of any referred callers after telling them your reason