B*llocks!
You just can't get sausage, egg and fish and chips like you used to in the good old days before health and safety legislation and preprocessed foods took hold!
I fondly remember fish and chips from British Fish n' Chips Shops (BFnCSs) of the 70s and they are nothing like the same now. Even the smell as you walk through the door (and the decor) is different!
In my discussions with owners and chefs, they tell me it's impossible to replicate them at home because the volume simply ain't there. They use huge amounts of oil (used to fry all manner of things) and you just can't scale down the batter without introducing differences. They clearly possess many secrets, not only about ingredients but about technique (scooping burnt bits out of the oil, for example, and selling them for tuppence)
Furthemore, there are real regional differences depending on where the shop is and where the chef and owner are originally from. For instance, in Australia, most owners/chefs are Chinese origin and their product is distinctly different from the Yorkshire lass' back home. They also use "flake" (i.e. shark) instead of cod.
Some even dribble curry sauce over the top and add mushy peas.
I'm also sure they add some "secret ingredients" to their salt and vinegar.
I'm even led to believe that they add potato to their chips ffs! :

I find that my smell gets desensitised, when cooking, so I advise going outside to take some fresh air before eating them. Lo and behold, upon your return, you will get that "smell" of used oil, just like your favourite local takeaway.
Of course it's important to leave them to settle after cooking and before eating as this mimics the trip home from your local and allows the food to relax and the flavours to permeate.
I've even seen photos of some members' efforts, but that doesn't really tell us much. They might LOOK the part (but any fool can do that) but what do they SMELL and TASTE like I wonder?

So they all go home and cook curries instead. It's easier, they say.