Help please we are travelling from uk to Vietnam for 2 days then from there to Cambodia via bus. Do we require a Visa. TIA

Not sure if anyone can help me please(?), but one would be extremely grateful if anyone can answer the following question for me please:

Which Thai Consulates/Embassies close to Thailand (which you can fly direct to) still issue Double/Multiple Entry TOURIST Visas for U.K Citizens please?

I know before that Singapore would only ever give you a Single Entry TOURIST Visa, and that Kuala Lumpur was also pretty much the same, and it seemed that Penang was the only place you could go to have a chance of obtaining a Double/Multiple Entry TOURIST Visa.

Is this still the same please? Any help/advice would be greatly appreciated. Thank you very much in advance :)