There is now a certain degree of healthy rivalry between Newmarket sausage makers, reduced from perhaps a dozen butchers at the start of the 20th Century to only a handful. Two of the most noted makers are the company established in 1884 by James Musk, who have held a Royal Warrant since 1907 (and who use soaked bread as a binder), and that of Powters, still operated by the original family (who use rusk).


Sausage rivals: Musk & Co's Newmarket Shop (above) www.musks.com and Powters www.powters.co.uk, (below)
It is not entirely clear where the form originates, but the name is known at least since 1849 when 'Bye-Lanes and Downs of England with Turf Scenes and Characters' by 'Sylvanus' has; "... we returned to breakfast on Newmarket sausages and water-cresses." Since then it has been strongly associated with this horse-racing town, and repeatedly mentioned as the necessary breakfast for visiting race-goers.
Edmund Spencer's 'Cakes and Ale' of 1897 has; 'Do not forget to order sausages for breakfast if you are staying at Newmarket'.
George Harpers 'Sport and History' of 1904 tells that at Newmarket on a race day there would be; "Stalls for the sale of all manner of possible and impossible things form a continuous line along that broad thoroughfare. Even uncooked pork sausages are offered for sale, but what the class of people who flock into Newmarket for half a day are supposed to want with them it is difficult to conceive. The Newmarket sportsman is scarcely the kind of person who might be expected to carry a pound or so of pork sausages with him on to the course, or on his lap, going home."
The London magazine 'Belgravia' (vol 16) of 1872 defines a day at the races as; "What was Newmarket? Sausages for breakfast - a lame hack - 500 to 400 taken twice, and lost..."
'The Real Adventures of Robinson Crusoe' by FC Burnand (1889?) has; "I could want a barrel of porter, tins of preserved vegetables, cases of Newmarket sausages, all sorts of condiments"