Hi James
I learnt to fly a microlight ( Eurostar ) at FlyCB Oxford, friendly folks, top notch airfield, atc, long runway etc
there's also a microlight school at Booker ( Eurostar ) , and another at Chiltern Airpark C42 & Dynamic, grass airfield, less formailties, without doubt there's others around.
also, a thriving microlight club (s) bucks microlight & berks microlight, message me if you require more details