I have been told by my country manager that they intend to implement a clawback from all sales if they close a sales without charging for the trainers travel allowance, so in most cases the trainers expenses for travel to birmingham for 4 days would be £1200,this now has to be charged if not they will take that money from the commission paid to the sales person. I personally find this offensive. The company is Australian and appear to have some very old and draconian ways about them. Is this legal?

Unless there is a contract. That says they can not, there is no reason why they can not.

Thank you

I don't know about your laws, but in the US, when the terms of a job change to the detriment of the employee, that employee can apply for unemployment insurance (after quitting the job).

If they make a change like that, as long as they apoply it to all employees equally then it should be legal.