Hi, their number is 0300 790 6806.
You will inevitably need to make numerous calls.
So, I'm wondering then, you weren't aware of the medical department. Did you only send off a D1 pack or something and nothing to the med department? I didn't know that could happen - in my instance I've had to send two sets of forms to the two different departments.
Price gave an excellent and concise answer earlier this morning to your query.
If you only sent off one set and nothing to the med dept then simply check to see if postal order has been cashed.