It took some fiddling with my old email archive but I found it, Joe Hudson was my teacher:

http://www.pronunciationlondon.co.uk/joe.html http://www.anenglishaccent.com/author.html

He is very good. We spent half of every session learning 'high level' stuff (phrases, paragraphs) and the other half practising 'low level' elocution (where to place your tongue and your lips for each sound).