Beware how goods are described on the packaging by the sender. I bought a helmet from the US, which should have been zero rated. It was described just as "helmet" on the customs documentation and attracted a levy and a collection fee.
I managed to get the levy back, after much argument, but Parcelforce would not even enter into correspondence about the fee as is was down to Customs' error, not theirs.
I saved nothing in the end. It actually cost me more, although I could not get the helmet I wanted in the UK or Europe.