This lovely drawing is by Jehan (John) Daly, whose biography and some other intriguing artist's studio drawings I found on the Liss Llewellyn Fine Art website. Daly was a close friend of John Stanton Ward, but for me he also links two artists I admire: Gilbert Spencer, who taught (or rather allowed him to follow his own path) at the Royal College of Art, and John Sergeant, another Welsh artist and masterly draughtsman.
Bathroom at Erdigg John Sergeant 1987
National Trust Collection
[Footnote: James Russell has recently highlighted Fay Ballard's quiet drawings in his blog, which you may also enjoy.]