Hi
If the company you work states it zero rated VAT, you do not charge them VAT, We had something simliar with products that we supplied to one of our customers.
The best thing is to phone your local VAT office, but get them to send it in writng, as they are very good at saying things over the phone.
But as soon as they come to inspect your books and you do not have it in writing, you will end up having to prove your case.
Regards
Eugene