In 1974-1976, V. Dargis was a member of the Lithuanian Union Council in Great Britain (LUCGB), in 1982 he was elected as a member of LUCGB Board for information and communications with divisions, since 1983 he was the Vice-President for Cultural Affairs, and 1985 to 1989 - the Vice-President for Press and Information.
1974-1976 m. jis buvo Didžiosios Britanijos Lietuvių Sąjungos (DBLS) tarybos narys, 1982 m. išrinktas DBLS centro valdybos nariu informacijai ir ryšiams su skyriais, nuo 1983 m. vicepirmininkas kultūriniams reikalams, nuo 1985 m. iki 1989 m. - vicepirmininkas spaudai ir informacijai.