They played on a waste site at what is now the Sandfields Estate, later renamed the Harlequins Field.

[2] At the start of the 21st century, in an attempt to modernise the governing body of Welsh rugby union and to bring Wales fully into the professional era, it was decided to restructure the Welsh leagues and to source new sponsorship revenue for them.

Teams would be allocated a division depending on their recent season's order of merit and their geographical location.

In the 2001/02 season, the Quins were placed in Lloyds TSB Division Two West, along with their local rivals Corus (Port Talbot) RFC.

Note: Flags indicate national union under World Rugby eligibility rules.