When we think of hay fever most of us will assume it starts when the weather hots up in May, but for tree allergy sufferers, symptoms occur in March and April. Hay fever is the most common allergy in the UK with around 1 in 5 being affected by it. And its effect on our working lives is nothing to be sneezed at; it is estimated that productivity drops by 25% and that 29 million working days...
