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Winnington was called to the bar at the Middle Temple on 18 May 1694. He married Anne Blome, the niece and heiress of Henry Jeffreys of Ham Castle in Worcestershire, and took the name Edward Jeffreys in about 1709 to inherit the Jeffreys estates.
He sat as MP for Droitwich from 1708 until his death. He was made a King's Counsel in 1711 and again in 1714. From 1711 to 1714, he was Puisne Justice of the Great Sessions for Carmarthenshire, Cardiganshire, and Pembrokeshire, and was Puisne Justice of Chester from 1714 until his death. He left no surviving children, and his estates went to his eldest brother, Salwey Winnington.
- Retlaw, William. The Parliamentary History of Worcester. p. 130. Retrieved 2008-03-12.
- Burkes Peerage and Baronetage
- Leigh Rayment's Historical List of MPs [self-published source][better source needed]
|Parliament of Great Britain|
|Member of Parliament for Droitwich
With: Edward Foley 1708–1711
Richard Foley 1711–1726
|Puisne Justice of Chester
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