Read a review of Richard Longman & Company.
This review was originally published in Car & Car Conversions in the early 1970's.
It gives details of one or two of Longman's innovations and asks the question;
Richard Longman luck or Genius?
Richard Longman & Company Catalogue.
Longmans were never much into advertising or publicity material of any sort, this is the only copy of a catalogue of their products that I have ever come across.
The reason advertising material is so light is that for once Richards conversions & craftsmanship spoke for itself.