Registering a UK trailer in Bulgaria

Hi,
Can anyone give any advice on registering a trailer, we bought the trailer new in UK but UK does not give any papers as it is not required in the UK, has anyone managed to register a trailer here without papers??
Any help or advice would be appreciated
Kind regards
Jim

We wanted to register a trailer 3 years ago but at KAT they said we can't because it's not a Bulgarian standard I can't remember but it's technical stuff so we had it made and got rid of the other.

The one i have is a brand new one i bought in uk, the trouble i have is the UK do not register trailers and give out papers, its totally laughable when you see the state of the trailers on the road here

This Bulgaria we live by their laws we like it or not