No booths round here, it would seem to be a Northwest thing.
Butter pie is the food of the gods, but is only available in Preston. It is a pie (obviously) filled with potatoes, onion and butter. Pure comfort food. Some people like to slice off the top, fill it with grated cheese, then replace the top, so the cheese melts. It was invented so that the inhabitants of Preston had a pie they could eat on a Friday when meat was forbidden.
I have only looked at the exotic sweets in Fenwicks tbh, I hadn't thought of there, I will look next time I go. I tried Grainger market for potted shrimps and there was nothing doing.
Places round here only seem to stock one type of Lancashire cheese, the shop in Preston has about five or six, although I have a vague memory of "the lancashire bomb" (a strong, waxed ball) having a website on it so may try a bit of creative googling.
I may attempt to make Chorley cakes myself actually, they can't be that hard, they manage to make them in Chorley...
If I got my mum to do me a food parcel, how would she go about packaging things like pie and cheese so they didn't disintegrate?