Accessing my work files?

I have just finished my job after working 2 weeks notice but as we left on bad terms my old employer (Arla Foods PLC) will not release my fork lift lisences or any certificates for courses that i attended (e.g. manual handling, fire safety, public speaking) whitch i took while with this employer. is there any way of getting them? the only other option i have is to pay for a re-test (about £260) for my flt license and then pay for the other courses.

Answer:
Those Qualifications belong to you, not the company. You are entitled to take them with you! I would complain to his boss, or, if that's not possible (he is his own boss), speak to the citizen's advice bureau.
i was told that when i did similar courses it was for the company and my certificates was only valid whilst with the company not sure if this right