Greene King is a British brewery that's changed hands a few times but is brewed in Bury St Edmunds, England - an hour-and-a-half drive North-East of London. Greene King also brews Old Speckled Hen. The Olde Suffolk is aged for two years on oak and then blended with a young, dark, full-bodied beer.
It's not technically a Porter, but nonetheless, these are my tasting notes.
BeerAdvocate (A-). RateBeer(94).
Appearance: thin, wispy head; flat coca-cola body
Aroma: for such a dark beer, a surprisingly light, bright aroma, smells a bit like cola with its bright sweetness, a malt and roast and some burnt toastiness lies beneath
Flavor: coffee-like with a strong smoky sourness; sasparilla (root-beer); a strong woodiness in the finish
Body: a lithe body with a bit of softness on the front of the palatte, but a firmness throughout; maltiness and sourness lingers
Drinkability: While sessionability is low, drinkability is very high - this would be great beer to have in your back pocket to pull out in almost any occassion
Summary: I can definitely see how this was an inspiration for the Old English Porter; it has subtlety and drinkability and warms up expceptionally well; it has some strange sour notes in it that some might be put off by, but I think it's pretty nice character.