Is it a real company? Where did you order it from?
.....if it was ebay or amazon lots of sellers hide in addresses from elsewhere, it could have come ex-uk. I know myself postage labels and invoices from Asian sellers are just pure fiction sometimes although the parcel address is UK -it didn't come from there. Liverpool, Lowestoft, London seem to be huge for import scammers and deliveries are stamped as such in the UK as point of origin despite tracking from China.
Iwill stick-up for RM and Parcelforce every time though. They are fantastic in almost every way to me in a non-std postcode. I have heard every excuse under the sun for lazy couriers my way. There is literally is no excuse.