These Regulations amend the National Health Service (Charges to Overseas Visitors) Regulations 2015 (“the Principal Regulations”) which provide for the making and recovery of charges for relevant services provided under the National Health Service Act 2006 (c.41) to certain persons not ordinarily resident in the United Kingdom. The Regulations come into force on 21st August 2017, except for provisions specified in regulation 1(2)(a) as coming into force on 23rd October 2017, which make provision for advance payments and refunds and extending the range of providers of NHS-funded services who must make and recover charges for relevant services from an overseas visitor.