What are the steps to get a Khor.Ror.22 in Thailand while on a tourist visa?

To obtain a Khor.Ror.22 in Thailand, you first need your marriage certificate from the UK properly translated and certified, which can be done through the UK Embassy or an honorary consul. After certification, the documents must be co-legalized by the Thai Ministry of Foreign Affairs. Once these steps are completed, you can register your marriage at the Amphur office, where you will be able to obtain the Khor.Ror.22 certificate. It's also noted that opening a bank account may be difficult on a tourist visa, so you might consider changing your visa status to a Non-O.