 At London Welsh, Maddock set several club records; he is the only player to score five tries or more in a single match on two separate occasions; once against Ilford Wanderers on 22 September and then performed the feat again against Oxford University on 5 February 1909.Maddock also set the record for most tries in a season, twice, with 25 tries in 22 games in the 1905-06 season, and then beat his own record with 26 tries in 30 games in the 1908-09 campaign.In his entire career with London Welsh, Maddock scored an impressive 170 tries, a record that still stands today.