Sure; ask questions. I am a 747-400 Captain for a major cargo airline. I am in the US, so I may not be able to answer UK-specific questions.
Note from the start that there is really NO difference in general between "cargo pilots" and other pilots. The main difference is brought on by the perception that there are more entry-level jobs in the cargo segment. While that may have been true in general many years ago, it is not necessarily true today. As with every other aspect of the airline industry, there are regional and local variations.