James' japanese pages
IIEL run Japanese teacher classes so have run Beginners, Elementary, or Intermediate classes for their students' teaching practice, when needed, at Charlton House, London.
While free classes may not offer everything you require, it can be a good change or a new challenge to work with other Japanese teachers.
Sakurakai run free weekly hour long volunteer classes, on Tuesday lunchtimes near Baker St. station.
Tip: (if you cannot send an email directly or want to send an email by another service later) to copy the email right click on the Sakurakai button label; select copy email address; and copy it to where you need it/ remember where you copied it.
Rant: The retail price for many (not all) popular, Japanese-sourced, textbooks are now in the £40 bracket,
Also the focus is often not on what we find difficult but what Japanese can't handle in other languages. We need less attention to basic information and dialogue, surely we need more, structured, learner-based print and/or internet materials.