NO ! If you have not worked with them for at least a year or two.
I know a nanny here but she was working in Hongkong b4 with her Scottish employer.
Beware of scammers in the internet. Never give/send money as they cannot help you. I met some who sent money here for paper processing daw but it was all fake. Kawawa talaga
Some parts of senchgen states accepts AU Pair. But not UK.