The Interland Cup is England’s only international competition outside the British Isles. England competes annually in this six-cornered match against two Belgian teams (Flemish and French speaking), the Netherlands, the French Ligue des Hauts de France de Course d’Orientation (LHFCO) and Luxembourg . The competition is truly a team effort spanning age groups from W and M14 to W and M60+: 42 team members in all. The Rules and Guidelines for the competition are here:
Interland Rules and Guidelines

The 2025 Interland Cup will take place on 2 March in the north of The Netherlands on the provincial border between Drenthe and Friesland, south west of Assen.

The hosts are the Nederlandse Oriënteringsloop Bond (NOLB) and their invitation/Bulletin 0 is is available from the link below:
Interland 2025 – Bulletin 0

Selection policies for the England team will be published in due course.