Scam warning over NHS test and traceScammers are posing as NHS contact tracers and asking for money

Scammers are posing as NHS contact tracersand asking for money to cover the cost of coronavirus testing kits, councils have warned, as they urge people to be on their guard. The "ruthless scam" has seen fraudsters posing as contact tracers to trick people into parting with their money or personal details. Separately, as the UK ditches the way its contact tracing app works and a blame game erupts between the government and tech firms,just what went wrong?