There are no email addresses on that page. This is a typical way that is used to make contacting possible without giving an email address to the public.
What happens when you press the “Send enquiry” -button is that your browser sends a HTTP POST request towards some address*, to a webserver, which then handles your enquiry. The webserver might send an email to some address, but it might not aswell. For example, the webserver might just add an entry to a database, and then some user might see your enquiry though a web interface.
* This you could check yourself using the browser developer tools and checking the Network tab while pressing the “Send enquiry” -button. I did not want to send trash to them just to check where the data is sent.
solved Can’t extract an email address from a webpage