Me and my family just started with ‘bike trailer trips madness’ and unfortunately we lost one very important part from our trailer.
Picture of it is attached.
I’m just wondering if you could help us to find online shop which can supply this part. We live in Southampton, United Kingdom.
Any help is greatly appreciated as we are planning longer trip to Isle of White soon.

Thanks in advance.
Przemek with family !

Link to see missing part
http://postimg.org/image/5p63wc7xx/

Do you mean the hooked (coper looking if the photo colouring is correct?) bit with a (looks like maybe M4?) simmonds lock nut and spring?

Im guessing thats a sort of spring loaded hook?
Im sure you could cobble something together yourself?