Went into the Middlewich branch of Subway at the weekend and it looks like they're doing the breakfast Mega Melt for 99p!
Bacon, sausage, cheese and poached eggs. That's a lot of sub for under a quid!
Not sure if national but well worth a check. Runs from 30th Jan to 5th Feb daily until 11am.
Information found on page 31 of the Manchesters edition of the Metro newspaper dated 23/01/17..
Offer includes a 6 inch mega melt sub for 99p, available from 30/01/17- 05/02/17, while stock lasts until 11am. Not valid for double meat, double cheese or any other extras. Not to be used in conjunction with any other offers or discounts. Participation may vary. Go to http://www.subway.com/en-gb/promotions/participating-stores-terms-conditions
to check which stores are participating in the Yorkshire and Granada regions are participating.