I used Muswell Hill Joinery for sash and an odd shaped casement window. They did a good job.
Thanks - I'll get in touch with them this week
I used the very local (on Avenue Rd N15) Londontraditionalwindows.net several times to make replacement sash inserts. But they do other wood work too.
Mentor, was great to deal with, although often quite busy, as are many tradesmen these days. He always made time to quote and respond.
That's great, will contact them as well - thnk you