[3] At the end of the 1950s, Matthews registered to the Council of Industrial Design, which proposed graphic artists to client entities.
[1] In the 1970s, he became involved in the designs of new Machin definitive stamps, picturing Queen Elizabeth II's profile since 1967.
When ordered, he designed new symbols for the Regional Machins in 1971, with new digits (Narrower '0' and '½') and letters to match inflation of the postal rates in 1983.
In the middle of the 1980s, he provided the Post Office with a large palette of colours, sufficient for the new next values.
Under the supervision of Post Office design adviser Barry Robinson, Jeffery Matthews prepared alternative essays from March 1982 pictures of the Queen by Lord Snowdon.
Essays with the latter position were designed from the photographic representation and from a portrait drawn by his son Rory Matthews.
[1] He proposed a Machin head design with micro-printed text wavy line for the ten pound stamp of 1993 but Brian Craddock's Britannia was chosen.