Planning on calling the embassy tomorrow to see what the definitive answer is to this as I am getting conflicting information. The e-visa website clearly states 10,000GBP with no minimum time requirement for both single and multiple entry.
Whereas, the Thai Embassy London itself is claiming it is 1,000GBP for single and 10,000GBP for multiple, funds deposited at least 30 days before application.
See pictures below.