I've had several packages sent US to UK over the last six months. I've never requested a particular service but left it to the sender. The only thing I've asked is that they declare it low value and a broken watch/watch parts. I've had DHL, UPS and even USPS from memory. The tracking is hit and miss once it leaves the USA but should tell you when it's been delivered. It's usually the Royal Mail postman than brings my broken watches. I've only had to pay customs once - when it was declared about £150 value. Good luck.