I just shipped an Ampeg head using Paisley Shipping.
Companies like parcelfarce etc. have an exception in their insurance/liability that says musical amplifiers aren't covered at all, even if it gets smashed to pieces. In fact, I never found a single company that didn't have that rule. Which kind of makes it a bit lucrative sending amps with them as the moment something goes wrong, even if they're to blame, there's nothing you can do.
That was until I found Paisley. They have a list of items that are excluded from insurance/liability. But amps aren't one. They'll cover it fully insured, door to door. And next day delivery will cost less than £20 for your AD200.
I fully recommend them to anybody wanting to send an amp head. Cheap, quick and actually responsible!