I suppose you could make a full English breakfast yourself. Not too difficult. They sell scones everywhere, now. And the rest of it is just like an American breakfast. However, I have also seen the addition of a small braised mushroom.
If you happen to be in Canada, here is a list of places that offer full English breakfast in Toronto:
The Old Nick The Queen and Beaver Public House The Senator Mildred’s Temple Kitchen The George Street Diner Emma’s Country Kitchen The Stockyards The Lakeview Restaurant The Wren Le Petit Déjeuner Fran’s Restaurant & Bar The Ace