Thank you for responding to my request for clarification. I wanted to
make certain that you didn't expect a home address.
According to IMDb Pro (a subscription service), Diarmuid Gavin is
managed by John Noel Management:
John Noel Management
10a Belmont Street
A page on the now-defunct CelebritySearcher website also mentioned
John Noel as Diarmuid Gavin's manager, with this additional
Agent JOHN NOEL MANAGEMENT
Address 10a Belmont Street
Town LONDON Great Britain
Postcode NW1 8HH
And, the clincher: the John Noel Management website has a page for
Diarmuid Gavin, complete with some audio clips and a slideshow of very
nice photos (you'll need to have Macromedia Flash installed on your
computer in order to view the photos):
John Noel Management: Diarmuid Gavin
Here's the contact page for John Noel Management, from the website:
John Noel Management: Contact
My search strategy began at IMDb Pro. After I found the info about
John Noel, I did a Google search. I turned up more than one address
and telephone number for John Noel Management, but I feel confident
that the information listed on John Noel's own website (the Belmont
Street address) is the most current contact info.
Google Web Search: "john noel management"
I hope this helps! If anything is unclear or incomplete, please
request clarification; I'll be glad to offer further assistance before
you rate my answer.