Ansbro was born in Glasgow and raised near Gatehouse of Fleet in the historic county of Kirkcudbrightshire in the administrative area of Dumfries & Galloway, Scotland.
Northampton Saints took notice of this and he became a regular in the number 13 shirt during their season in National Division One, he also scored in the EDF Energy Trophy final.
London Irish head coach Toby Booth said: "He's quick, powerful with a great future ahead and will fit in nicely."
Ansbro commented that "there are some great players who have committed their long term futures to the club and that speaks volumes for what is happening there.
Ansbro and the rest of the Scotland team put in an impressive performance against a clinical French side despite eventually losing the match 34–21.
His first points for Scotland came in the 10–6 victory in a 2011 Rugby World Cup warm-up game against Ireland[10] where he scored the winning try in the 76th minute.