The school also has a pre-school class for three and four-year-old children, and a baby and toddler group called Miri Mawr that meets on Monday mornings.

That institution, the Ysgol yr Hendre, was opened on 6 March 2006 in Trelew to serve the Welsh-Argentine community.

[5] Speaking in the Houses of Parliament in June 2000, Julie Morgan, MP for Cardiff North, described the school as part of the general demand for Welsh language education in Wales and a lifeline for families moving temporarily to London.

[6] In 2015 the school moved to its current home Hanwell Community Centre in Hanwell, London borough of Ealing,[7] a building with a long history as an educational setting having been home to a school attended by Charlie Chaplin between 1896 and 1898.

[14] In 2019, the London Welsh School were winners of the Cân Actol Blwyddyn 6 ac iau at the Urdd National Eisteddfod in Cardiff Bay.