Microlights are looked after in the UK by The British Microlight Aircraft Association.
The association is responsible to the Civil Aviation Authority for everything to do with microlights from approving aircraft through to pilot licencing.
Their website has a lot more information on it including the syllabus for the NPPL course and, if you become a member, you will receive monthly copies of Microlight Flyer which is easily the best aviation magazine in publication. Students get a special discount rate in their first year.
The CAA have published a leaflet to help people understand what to expect from a General Aviation (GA) flight and feel informed before deciding whether to fly. Sharing the leaflet before a flight can help prospective passengers better understand the experience and make informed decisions. You can find a copy of it by clicking this link.