Seachain:
Malaysia uses exactly the same type of 13 amp plug as in the UK (surprised me too).
Sri Lanka uses the old round-pin style that was superceded in Britain about 50 years ago by the standard described above, and which you very occasionally still find in UK buildings which have not been rewired. Adapters for these are harder to get, but if you're going to get them anywhere the UK is the place to do so.