NatWest customers are continuing to report issues with transferring money as the online banking system apparently faced a glitch tonight.
Asked whether Mr Curry was receiving any error messages, he responded:
@suswatibasu I got the message 'service is temporarily unavailable', while I was standing at the till at Tesco. Embarrassing.
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The strike is part of an ongoing dispute over guards on trains.
The Saudi government has denied the claim.
The vessel disappeared in November 2017 with 44 crewmen aboard.