A pensioner died after a fatal collision with a car – with a man in his 20s arrested afterwards. Police are appealing for a key witness to come forward following the incident in Lynn earlier this week. At 9.06pm on Monday at the junction of St James Road and Blackfriars Street, next to the St James swimming pool, a silver BMW 530i collided with a pedestrian. The road was closed overnight while emergency services attended, including paramedics. The pedestrian, a man aged in his 70s, was pronounced dead at the scene. The driver of the BMW, a man in his 20s, was arrested on suspicion of causing d…