That's really useful thank you. My next question was how long it might take to get the re-entry permit and can I get one at Bangkok airport before heading on to Sri Lanka, but I think i've found out ... Yes & allow up to 4 hours
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But sounds like it could be worth trying my luck to start with an exemption on first entry and if they insist on activating the SETV, I'll go & get the re-entry.