What are the requirements for obtaining a non-immigrant O visa from the Thai embassy in London?

The user called the London Thai embassy and was told that to obtain a non-immigrant O visa, they only need to provide a copy of their marriage certificate and a copy of their partner's Thai passport or ID card, with no financial requirements necessary. However, there is some confusion as the embassy's website mentions needing to provide 3 months of bank statements. Other commenters suggest trusting the information given by the embassy directly.