I went to the dojo search on this forum.
It appears that Martin Sensei is associated with Jiyushinkai AikiBudo.
The founder of that organization is Chuck Clark Sensei. I've not met him personally, but I know people who have. They tell me that his aikido is [BOLD]excellent[/BOLD].
We have exchanged e-mails and I found him to be intelligent, thoughtful and quite the gentleman.
He used to post here, I believe. I know he used to post on Aikido-L regularly.
Their website is http://www.jiyushikai.org/
. I checked their dojo locator. Martin Sensei's dojo is listed there.
You could also e-mail them and ask them if Martin Sensei is still associated with them.
If Martin Sensei has any of the attributes of Clark Sensei, you could not do much better.