Hairdressers sharing data

Hi,

I rent a room within a hairdressers, it's going well but would like to widen my client base.

The hairdressers have been running for a long time and are doing really well. They have a large client base. They are always happy to promote me etc.

From a legal standing if the Hairdressers shared some of their customer data (email addresses in this case) with me and I sent out a mail shot to them-an offer to all of their clients-would this be a breach of data on their part?

I've had a...

Hairdressers sharing data