Any microlight aeroplane that:
Yes, the requirements to register and insure your aircraft remain unchanged as the exemption only refers to deregulation for airworthiness purposes. If you make use of the exemption you will need to inform your insurance company.
Yes, providing the aeroplane conforms with the criteria set out within the exemption and it is not already covered by European Regulations that govern its design and construction.
Yes, the applicable pilot licensing and medical requirement remains unchanged.
The CAA has produced a new exemption that applies to all single seat microlights that are deregulated for airworthiness purposes (ORS4 No. 1024). If you make use of the exemption you will not need a noise certificate.