Was it just a 'paraglider' or a powered paraglider (PPG)?
As they're unregulated, the cowboys who fly them seem to think they're exempt from the ANO.
We had one near Farnborough whose 'strip' was on the downwind leg for runway 24 (Wanborough) and he got most annoyed one evening after having a close encounter with a Lear 45 at 1,700 ft. He even operated (without permission) during the airshow when RA(T) was in force.