The UK Daily Mail is reporting that visitors would have to put up a cash bond to enter Britain under radical reforms to be unveiled by Theresa May.

They will be required to pay the ‘entry fee’ as part of a guarantee that they will not be a burden on taxpayers and will leave when their visa expires.

The cash would be repaid when migrants leave, but only if they demonstrate that they have not drawn on services, such as non-urgent NHS care or other elements of the welfare state.

The Guardian article had the following quote :

"The idea for the levy, which can be imposed on temporary immigrants under the 1999 Immigration and Asylum Act, was floated by the prime minister in a speech in October 2011. Home Office sources told the Daily Mail the bond would be aimed at "high-risk" individuals of "two or three nationalities"."

I would guess that Thais would not be one of those nationalities, and it also suggests it would be aimed at high risk individuals, not a blanket requirement.

Purely speculative at the moment and yes there is already legislation in the 99 Act that allows for such measures, I will close this thread for now, if the UK Government lay firm proposals then we can reopen or start a new thread.