I'm looking for an online training provider for the Liquid nitrogen safety - do you know of anyone please?

Thank you very much

What aspect of training - user, handler, responsible manager, H&S? If your employer is already established with cryogenic gasses perhaps the supplier e.g. BOC should be your first port of call.

As said, I am not sure that an online course is sufficient. It can give you awareness of the dangers, but you need to establish competence  which means developing and maintaining practical knowledge about liquid nitrogen.

What level is your organisation working at? Are you handling relatively small amounts of liquid nitrogen or are we talking about very large industrial tanks with hundreds if not thousands of litres? Your training must reflect what you do.  Who is the training aimed for the front line users or managers? Do the managers actually appreciate what their staff are working with?

Lots of questions but you need to have answers to the if you want to select an appropriate training package.