Best to go by what is specifically stated on the Thai eVisa Website where all METV Applicants input, submit, and would receive their actual METV E–Visa PDF Files and it is Tourist E–Visa financial requirements of:
THB ฿20k Thai Baht
Try to directly contact the Thai Embassy in London for the most recent, updated financial requirements they may specifically have for Multiple Entry Tourist E–Visa (METV), as many Thai Embassies and Thai Consulates have moved away from the old THB ฿200k Thai Baht Financial Requirement for METV's
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