Just solved my own query by emailing SamCasey who also descends from Anne Marbury whose mother was Bridget Dryden.The line goes like this:
King Edward III Duke Thomas of Woodstock (b 1312) Countess Anne of Gloucester of Stafford (b 1383) Duke Humphrey DeStafford of Buckingham (b 1402) Joan/Joanna DeStafford m Sir John Knyvet Margaret Knyvet m Richard Chamberlain Richard Chamberlain m Sibyl Fowler. Anne Chamberlain m Sir Edward Raleigh (b 1470) Bridget Raleigh m Sir John Cope Elizabeth Cope m John Dryden. Bridget Dryden m Rev. Francis Marbury.