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dubtap
I'm not a doctor and you'd probably be better off googling this than listening to me, but this is what I think I know.
People with a genetic tendency to have hayfever sometimes don't have it for years. But it can be triggered by an episode of stress. After that they have it every year.
Air pollution from vehicles aggravates hayfever.
Hayfever is an allergy to pollen from certain species of plant. Different people react to different species. (In my case it's grass and plane trees.) Your reaction in Hampshire might be some other plant which you don't normally encounter. Maybe something on a farm, or at a garden centre?