I had a great experience with i2visa recently getting documents authenticated for my Chinese work visa. Joey always responded to my messages quickly and even gave me some advice outside the visa process. I wanted to come into the office to hand-in my documents and explain my employers requests and this was no problem at all, got a time arranged easily and wasn't rushed. Everything was done on time and I received scans of the documents so I could send them to my employer immediately. This service was also the cheapest I managed to find in Scotland and I would use them again, it saved me a lot of hassle and uncertainty. For ESL teachers: Make sure you do your TEFL course with a UK based company as I had to do a second one after the Chinese Consulate rejected mine.