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Roy Lilley, former chairman of the old Homewood NHS Trust in Chertsey, Surrey - which later merged with Ashford and St. Peter's Hospitals NHS Trust - and now an independent commentator on health service issues, said some impact on services would be "inevitable".

The highest temperature recorded so far this year was 21.3C in Northolt, west London, and Chertsey, Surrey, on 20 March - but that figure is expected to be beaten on Friday.

There is a good chance that the highest temperature recorded so far this year - 21.3C in Chertsey, Surrey and Northolt, London on 20 March - will be beaten.

With more cloud elsewhere - and some rain - temperatures will drop from Thursday's high of 21.3C recorded at Northolt in London and Chertsey in Surrey.

Each year, they walk from the Stoop, across a bridge crossing the Chertsey Road, through a gauntlet of home fans and into Twickenham.