The not-refreezing advice does not need to be followed for all foods. It's important for some things, like chicken and mince. When these are thawed at room temperature and may be at temperatures above 10 deg for some time, bacteria (not killed by freezing) may multiply and will still be there in greater numbers when next thawed. There's an increased risk if not cooked properly, especially as after freezing, the texture of the food may be broken down releasing more juices to feed the bugs!
However, things like bread and cakes can be safely re-frozen as they don't have many bacteria to start with and also don't provide a good growth environment for the bugs.
Pork pies should be fine to freeze, unless the package specifically says not to. Even in the unlikely chance they had been frozen before, it wouldn't cause a problem, as long as they've been kept cool before freezing. In my opinion, it would be best to freeze when delivered.