The official best English breakfast is served at my local caff - the Super Sausage. Winner of the Britains Best Cafe award in 2016. http://supersausagecafe.co.uk/ . No, I don't work there or have a financial interest but I do eat there regularly, as my waistline will confirm :-)
Two best quality pork sausages, 2 rashers of back bacon, hash browns, fried egg, mushrooms, beans and good black pudding. Add toast and a mug of Twinings English Breakfast tea for perfection.
As for the sauce - I prefer Rocket Fuel sauce, which comes from New Zealand (like HP but with more kick - plenty of spices) and English mustard for the sausage.