The grass pollen risk will be moderate decreasing to low as the season goes into decline. Some weed pollen will be airborne and spores will also trigger symptoms in some sufferers.
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The Met Office has issued a wet weather warning with thunderstorms as the Anglia region suffered five times the normal rainfall last week.
The Health Secretary, who pulled out the leadership race last week, says Mr Johnson is the best person to unite the party.
Former Norwich City midfielder James Maddison will wear a special pair of boots in honour of a little girl from Norfolk.