 He is single.In 2020, Montgomerie reacted to a court ruling where the decision to build a third runway was found unlawful due to not taking into account the UK's international agreements and currently settled law.His reaction saw him ridiculed by other users as he said "I fear judges tend to “interpret” rather than “enforce” laws" to which legal twitter had a field day with the Secret Barrister replying "I fear firefighters tend to “extinguish” rather than “embrace” fires" , George Peretz QC giving a thread on why the decision was given  and other twitter users remarking that this was, in fact, the role of Judges and was "Law 101".