sebastian vettel past lewis hamilton, signalling an end to mercedes‘ domination. and the blues guide thinking that has led to new cloud formation being recognised officially. yesterday was the warmest day of the year so far today, more of that glorious sunshine for custody, so you can expect more of these blue skies. a full forecast in the next half hour. good morning. first, our main story. police say they might never find out why khalid masood killed four people near the houses of parliament on wednesday. scotland yard now say they believe he was acting alone. the family of pc keith palmer who was killed by masood have released a statement, thanking those who were with him when he died. alexandra mackenzie reports. 82 seconds. that is all it took. in that time, khalid masood caused the deaths of three people on westminster bridge, and injured many more. he crashed his car into the railings, ran through a gate upper houses of parliament, and stabbed pc keith wallis pc k