LONDON, March 16 (Reuters) - Britain said on Thursday it would ban TikTok on government phones with immediate effect, a move that follows other Western countries in barring the Chinese-owned video app over security concerns. TikTok has come under increasing scrutiny due to fears that user data from the app owned by Beijing-based company ByteDance could end up in the hands of the Chinese government, undermining Western security interests. See here for a complete list of exchanges and delays