The case of Alexander Drummond from near St Andrews in Scotland still puzzles police seven months after his death. Who were the two men seen running towards the farm track where his body was later found?

And in Bristol a gang of builders could be responsible for a series of armed robberies between August and December of last year. Twice they broke in overnight through the roof and overpowered building society staff as they arrived for work.

Three months ago, 14-year-old Tracy Meade went missing from her home in west London. Two weeks later her body was found in the Grand Union Canal. She had been murdered. Hours earlier she had been seen in Shepherd's Bush - police hope someone may have seen who she was with.

There's also a report on a chase through London's Covent Garden, which led to the fatal stabbing of Detective Constable Jim Morrison last December, after he discovered a thief rifling through a woman's handbag.