The underlying point is broadly supported: a 2012 Guardian profile described Guy Farage as “a drinker and president of the local Territorial Army,” which is close to Nigel Farage’s remark that his father was busy with his regiment. (theguardian.com) However, the wording here is imprecise and “very busy” is subjective; I could not verify the exact title “president of his regiment” from an official regimental source. Later archival material does show Guy Farage remained deeply involved with the Kent and Sharpshooters Yeomanry Museum as chairman of trustees, which supports that he stayed active in military-regimental circles. (bishopsgate.org.uk) Sources: The Guardian, “Nigel Farage: I was never scared of being out on a limb”; Bishopsgate Institute / Mapping Museums project interview transcript for Guy Farage and Daniel Taylor.