http://www.legislation.gov.uk/uksi/2017/550/madeThe Air Navigation (Restriction of Flying) (Rhinog Fawr) (Emergency) (Revocation) Regulations 2017King's Printer of Acts of Parliament2017-04-18 The Air Navigation (Restriction of Flying) (Rhinog Fawr) (Emergency) (Revocation) Regulations 2017RegulationsThe Air Navigation (Restriction of Flying) (Rhinog Fawr) (Emergency) (No. 2) (Revocation) Regulations 2017reg. 2(d)reg. 1