Rail company could be stripped of services if there is no improvement soon after weeks of disruption.
The advisory, the first in the weather service's 164-year history, comes amid scorching temperatures.
Leafy salad growers say the summer's high temperatures have boosted demand but damaged crops.
Lukas Lacko, the world number 94, will face Germany's Mischa Zverev in the Nature Valley International final at Eastbourne.
Caroline Wozniacki saves match point against Angelique Kerber to set up a meeting with Aryna Sabalenka in the Eastbourne final.
Two other men were jailed last September after also admitting charges in connection with the armed cache.
The latest tremor was measured having a magnitude of 2.4 near Gatwick Airport.
There is concern that volunteers who go on to join the regular police service have not been replaced.
Aryna Sabalenka stuns defending champion and former world number one Karolina Pliskova to reach the semi-finals at Eastbourne.
Several companies urge people to conserve water as Severn Trent make emergency deliveries.
Britons Kyle Edmund and Cameron Norrie are beaten in their respective Eastbourne quarter-finals.
A first-of-its-kind study sheds light on the survival of the human race.
PC Russell Kyle is accused of dangerous driving after a man was hit by a patrol car in Brighton.
Streets across England are being decorated in flags as the national football team progresses in the World Cup.
League Two side Crawley Town sign teenage striker Brian Galach on a three-year deal, with the option of a further year.
Championship side Ipswich Town sign Crawley winger Jordan Roberts on a two-year deal.
The New Webb Telescope will look back in time to the origins of the Universe and search for inhabitable planets.
Houses and furniture shook during the 2.6-magnitude tremor the epicentre of which was at Newdigate.
Kyle Edmund beats fellow Briton Andy Murray in straight sets to reach the quarter-finals at Eastbourne.
Crawley Town sign forward Ollie Palmer from Lincoln City for a nominal fee on a two-year deal.