hi, I've transhipped a betta from Thailand before and it went relatively smoothly. the only problem I encountered was delayed flights because of bad weather at the Thailand end. I was dubious but I made sure I picked a seller who imported legally through one of a few UK transhippers (I used Dani Pegley as her prices were slightly cheaper). if the seller offers to send to you directly, don't do it as it doesn't guarantee anything and you may even be liable for fines!