The death of Percival Marshall was announced in the ‘M.E.’ for April 22nd 1948. The April 29th edition carried an unsigned eulogy, thought to have been written by J. N. Maskelyne. This was reprinted in the Centennial Celebration Collection No. 10 “Model Engineer, the first 100 years”.
The History of the SMEE “100 Years of Model Engineering” also carries some information in Appendix A “Presidents of the Society”
Geoff