the original post wasn't very specific. "allow a country to accept a foreign PPL for a 28 days a year non-commercial "holiday" license, after a 1 hour acclimatisation with an instructor and filling out a form."
In the UK - It depends on if the pilot is resident, or visiting. It also depends where the aircraft (operator) is based.
Full details here
https://www.caa.co.uk/commercial-ind...n-uk-airspace/
The two simple cases are:
Visiting pilots who wish to fly for pleasure in the UK, in an aircraft of the same registry of the State of their licence issue, do not need permission from the Civil Aviation Authority (CAA).
Visiting pilots who wish to fly for pleasure in the UK, in a G reg aircraft You will need to:
- Be in current flying practice on the class or type of aircraft you wish to fly in UK airspace.
- Be flying purely for pleasure, private flying, not receiving remuneration. The flight can only be conducted in non-complex motor-powered aircraft, and do not allow fo flight instruction or examination.
- Meet the requirements of, complete and submit forms SRG2141and SRG2142.
- Please note there is a fee associated with SRG2142, more information can be found in the related information section at the bottom of this page.
You must:
- Hold a valid Licence/Certificate (that is a licence that is not subject to suspension, limitation or other enforcement action by the issuing authority).
- Hold a valid, current rating relevant to the aircraft to be operated, and the privileges to be exercised, demonstrable by reference to appropriate logbook and licence evidence.
- Hold at least a valid Class 2 Medical issued by the issuing authority.
- Hold an “English proficient” endorsement on their ICAO licence, to meet the minimum level 4 proficiency, or have their proficiency confirmed by a UK Civil Aviation Authority (CAA) Approved Language Proficiency Assessment Centre if no such endorsement applies or the candidate wishes to be credited with proficiency levels 5 or 6 (Form CAA5003 applies).
- Complete an acclimatisation flight which is a check flight conducted with a qualified UK instructor, the aim of the flight is to demonstrate that you are safe to fly the aircraft in UK airspace.
You must keep the declaration you have made to the CAA. Once you have received email confirmation from the CAA, you can fly in UK airspace. Please note the expiry date of your declaration is stated on your confirmation email from the CAA.
For more than 28 days per calendar year:
You need to hold either a UK short- term validation or a UK licence.