In the American South there is a delicacy (mostly favored by the older generation these days) called "Hog's Head Cheese", and it sounds like it might be exactly what you're looking for... it's a jelly made of pork stock with bits of meat and spices suspended in it. A lot of Southern recipes have an English and/or Scottish background, as this is where many Southerners' ancestors originally came from, so it wouldn't surprise me if "Pork Brawn" is the direct parent of "Hog's Head Cheese". This recipe is from the days when it was said that Southerners "ate every part of the hog but the squeal".
Here's the recipe, but be warned - it is not for the faint of heart or for those without easy access to pig's heads & feet. This recipe is Cajun-influenced, which accounts for the large amount of cayenne pepper & garlic - if you think this will make it too spicy for your taste you can just leave it out.
HOG'S HEAD CHEESE
head, ears & feet of a hog
1 tablespoon salt
1 tablespoon black pepper
1 tablespoon cayenne pepper
1 teaspoon garlic powder
3 cups finely chopped green onions (scallions)
2 cups finely chopped parsley
Remove the eyes and brains from the head and split the head in half. Singe, wash and scrape the head thoroughly, removing the excess fat. Singe the pig feet; wash and scrape. Singe, wash, and clean the ears thoroughly with hot water. Place all the pieces of the hog in a large pot; cover with hot water. Boil until the meat drops from the bones. Reserve 2 cups of the broth. Put the meat through a meat grinder. Add the salt, pepper, cayenne, garlic powder, broth, green onions and parsley to the meat.
Place in loaf pans, press with weights and refrigerate overnight. Slice, and store in jars covered with vinegar.
The above is a pretty old recipe, and I have not made it myself. I believe the "singeing" is to get rid of any bristles or hairs which may remain on the head. How you should do this, I have no idea, other than using tongs to hold each half-head one at a time over one of the burners on your gas range. Or if you have the ability to build an outdoor fire in your backyard you could try it out there (this is probably how it was originally done), but your neighbors may start making some disturbed calls to the local police
Good luck!