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US to UK is different ball game to same country or neighbouring western european country. I got my bike box shipped from a hotel in Sevilla to Girona after my crash using hotel and courier company (well my missus did) and my bike is still in Portugal but another mate had picked that up after I collected it from a cop shop with a taxi. Basically, lots of stuff is possible if you want to spend the money and time doing it. I could've left the bike at the hotel and done the same thing with a courier bringing it back.
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bike
I have no doubts that carriers will take bikes. Passports may be problematic. I could just Google it and see.
Yes, I have googled it and dpd won't take pasports:
https://www.dpdlocal-online.co.uk/prohibited-itemsYou might find someone else who will but carriers generally have similar rules.
Actually maybe you can, DHL will do it:
https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwiVp5CnqcKHAxUcQEEAHUyfIE0Q9cILegQIDxAA&url=https%3A%2F%2Fwww.overlandexpress.co.uk%2Fdocument-courier%23%3A~%3Atext%3DYou%2520can%2520use%2520our%2520DHL%2Capplications%252C%2520marriage%2520and%2520birth%2520certificates.&usg=AOvVaw3X77yD5iCNbJ_qP-OtvCxe&opi=89978449
Will carriers even take passports?
I'm on holiday in France and left some medicine at home. Couldn't get my wife to send it out without lying about what was in it, and do they xray or otherwise check some packages...?
My boss once left his suit in a hotel wardrobe in the US. We couldn't get a carrier to take it back to the UK.
It's hard to get non standard stuff shipped around the place.