Hi there
The only one I know about is with Reed (
www.reedlearning.co.uk), and the only reason I know of it is because their training directory landed on my desk. It looks a bit pricey though, and I'm not sure that it covers enough specifics of office management. I see they also do separate Health & Safety at Work, Employment Law and HR courses that might be more what you're looking for.
Anyway, worth a look - they look like they have some pretty good courses across a wide range.
Hope this helps.
QB