Deluxe and the System Spigot smokes about the same. But internally, they are slightly different. System Spigot doesn't have "condenser" bit at the end of the tenon. But honestly, I don't notice any difference while smoking.
You are in UK. Of course, they won't sell you a knife set. They are designated as deadly weapon in UK. I hope they will let you keep your butter knives :) With NHS, British teeth don't look like much of a cutting tool. J/K!!!
It all depends on the pipe and the person smoking it. I always clean as soon as I'm done smoking. And I do take my pipes apart middle of smoking also. Some times, the tenon will get stuck. I think that's fashionable like JRRT.
There are ways to fix badly packed bowl without dumping it. It all depends on where the problem is. However, first thing I do is put pipe cleaner all the way to bottom of the chamber and open up the air way.
Never really had "comfort food tobacco". Other than codger blends, I haven't smoked same tin twice. There are so many blends out there. Capt. Black Royal could be it, or Carter Hall. They two blends I smoke if I'm out of an idea.
After using tobacco for 40+ years, nothing seems to bother me. Well, fresh out of tin red Va gives me nausea. But, after few weeks in a jar, they are great.