The Reeves 3.4 cc diesel of 1948 was the first compression ignition model produced by Edward Reeves of Shifnal in Shropshire, England. Reeves ran what was essentially a "cottage industry" operation - the proverbial "garden shed", in all probability! He manufactured a number of different model engines to very high standards of precision, albeit in extremely small quantities. The 3.4 cc diesel was a very well-made unit but was both bulky and heavy as well as being rather underpowered, even by the standards of its day. It became quickly outdated by new and superior design, hence not surviving long in production.
For the full story of the Reeves 3.4 cc diesel, see my earlier article which may be found on Ron Chernich's "Model Engine News" (MEN) web-site.