Brown had a successful 2010–11 season with Quins, culminating in winning the Amlin Challenge cup, beating Munster at Thomand Park on the way to the final against Stade Francais.

[5] At the start of the 2019/2020 season, while still an active player, one of the bars at Harlequins’ home ground (The Stoop) was renamed in Brown’s honour.

On 4 April 2021, it was confirmed that after 16 years with the club, Brown would officially leave Harlequins and join Newcastle Falcons on a two-year deal ahead of the 2021–22 season.

[10] Brown vied with Ben Foden for the England full-back spot in 2012, coming off the bench in the victory over Scotland at Murrayfield.

He was finally picked at fullback by Stuart Lancaster and was subsequently named England's Man of the Series following his form during the 2013 Autumn Internationals.

Brown scored his first try for England in the 2014 Six Nations Championship match against France on 1 February 2014 and his second came a week later in a comprehensive 20–0 victory against Scotland.

[13] Brown was an integral part of the England team that won the RBS Six Nations Championship in 2016 and played every match in the 3–0 series win over Australia.