Until the advent of the
RFU league system the club's fixture calendar was made up of a series of friendly games against other local old boys' sides including Old Paulines, Old Cranleighan, Old Whitgiftian and many others. When the leagues started in the 1990s King's were placed in
Surrey 1 where they remained until 2003 when the 1XV were promoted to
London 4 South West and three seasons later promoted again to
London 3 South West. In the years that followed he club remained predominantly in that league (which from 2009 to 2022 was known as
London 2 South West). Finally, in 2018–19 King's won
London 2SW in a record breaking season which saw the 1XV record an unprecedented 22 wins from 22 games with 22 try bonus points and achieve a maximum tally of 110 points – a first for
London 2SW (previously
London Cornish had gone undefeated in 2016–17 but drew two games including one versus King's). The achievement earned the club recognition in the national rugby press with coverage in
Rugby World Magazine, Rugby Club Magazine, The Rugby Paper and on the
5 Live Sport Rugby Union Weekly podcast. King's 1XV were the first team in the country to be promoted in 2018–19 as confirmed league winners, doing so in mid-February. The club's player base was originally drawn predominantly from alumni of
KCS but with the passing of the years has become increasingly diverse with representation from throughout the UK and a notable contingent from South Africa and
Zimbabwe in the 1990s and 2000s. The club has seen a number of senior players achieve international honours for minor rugby nations including
Zimbabwe,
Hungary,
Denmark,
Norway,
Slovenia,
Gibraltar and
Jamaica 7s. Historically the club has maintained a good relationship with
Harlequins and a number of Quins players have begun their coaching careers at King's alongside their playing commitments including
George Robson,
Joe Gray,
Charlie Matthews and
Will Evans. ==Cup competitions and 7s==