On 16 June 2021, Switzerland and the United Kingdom concluded a mutual agreement on the conduct of arbitration proceedings in accordance with Art. 24 para. 5 of the DTA between Switzerland and the United Kingdom.
The agreement shall contain detailed information on the initiation of the arbitration proceedings before or after the expiry of the 3-year period of Art. 24 para. 5 lit. b, on the conduct of the proceedings and on the selection of the arbitrators.
The agreement is available here.