The UK uses the 'PAL I' broadcasting system. which is only used here and in a few countries that were formerly, or remain, British (such as Hong Kong or the Falkland Islands) or where British TV engineers helped establish TV broadcasting (e.g. Angola). A TV set manufactured for any other system won't work here. (Even a set designed for use in, say, Hong Kong might not work if their transmissions use a different part of the radio spectrum). Mainland China uses the (incompatible) 'PAL D' system.