The question I'd like to know the answer to is:
Was she given the chance to continue teaching? If so, how did she handle any student awareness of the pictures?
There's plenty of teachers who could handle this. If she has the respect of the students
because of how she teaches, that's unlikely to change due to the pictures.
If this adversely (and importantly,
materially) affected her ability to teach, then perhaps the school authorities have a right to ask her to leave. Otherwise, they should leave her the hell alone.
Basically, if she was no longer able to fulfil her role at the school -- that's a problem. The fact that these photos exist is
not.
(and for the poster who said most UK teachers had hit every branch of the ugly tree... well, you should've been at my school. I had an English teacher for my A-Levels (17-18yrs old, pre-uni qualifications, for non UK'ers) who was a) stunning, b) incredibly sexy (you know what I mean... the kind of person who just *is* sexy, irrespective of appearance) and c) the best damn teacher I ever had. Her knowledge, enthusiasm, understanding and teaching ability are nothing short of phenomenal. Now I'm a decade or so older, we're actually still friends. I've sometimes reminded her of points a, b and c above. She usually just smiles and says "It was all part of the plan."

)