Sockets in Thailand
Type AType BType CType O
Your the UK plugs don't fit the sockets used in Thailand.
Thailand is easy from the UK on the voltage side, less so on the plug. Thai sockets accept a mix (Types A, B, C and O) but not the UK's Type G, so you'll need an adapter. Voltage is the same 230V, so no converter needed.
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Yes, Type G isn't accepted; bring a Type A or C adapter.
No, both run on 230V.
Types A, B, C and O, at 230V / 50Hz.