Living too close to overhead power lines appears to increase the risk of childhood leukaemia, according to research carried out in Britain.

A major study found that children who had lived within 200m of high voltage lines at birth had a 70% higher risk of leukaemia than those 600m or more away.

However, the Oxford University team has stressed that there are no accepted biological reasons for the results and that more research is needed.

They said it may be down to the type of environments where pylons are located.