Many thanks to those who replied to my query. Michell was the key, and I have since found the two in the Sidney Pedigree. The arms are, respectively, Michell and Matham: Sir John Michell, who was Mayor of London in 1424 and 1436, married Margaret Matham, daughter and heir of Hamelin de Matham -- a family from Matham and Sawbridgeworth in Hertfordshire. Their daughter Cicely married William Sidney, Philip's great-great-great-grandfather.
Thanks again,
Roger
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