Shame about AMT, I refuse to give SSP my custom, though admittedly that's easier said than done given its not always obvious if a place is an SSP outlet.
Agreed on AMT, I haven't bought much from there in the past but they aren't too common in the places I've been to I guess. Certainly in years gone by I would favour places like Pumpkin and Upper Crust because of the sadly long-gone Bite card discount and the loyalty scheme they ran. I don't boycott SSP brands, but I rarely use them given how expensive they are.
Someone mentioned Wimpy, and I'm also amazed they're still going. I never went to the one in Swansea, I had many opportunities and it was fairly well located. Back then though, 17 years ago, I was much more into my favourite meal, a supersize XL Bacon Double Cheeseburger meal from Burger King. Oh my the amount of times I used to have that meal! I honestly am not sure if that is the primary reason why I didn't ever try Wimpy.
Spud U Like sounds awesome, I don't know why I am not familiar with them. Perhaps I only ever found them when I was still in my meat-eating days, or only when I had already been somewhere else for a meal, whatever the reason I've not tried their food but it sounds like an excellent idea. With an ever-increasing number of vegetarians and vegans, there is every chance they'll manage to cling on and become a success. I'm so interested in this company I'm about to look them up!
EDIT: Good grief no wonder they don't appeal to everyone, the majority of the photos on their website are full of images that appeal only to meat-eaters

There's not many locations that's for sure, it'll take some effort to get to one of their outlets! Put it this way, their website put me off the food. Takeaway potato-based dishes sounds great, but this lot that I've seen offered made me *less* hungry rather than encouraging me to visit!