The biggest question I have about Fallout London is how are you suppose to tell the Ghouls apart from the Brittish?
The biggest loss of Fallout 4 was the complete and utter lack of progression in guns. Its there, they have tiers that could of made progression in the game feel really cool, where early on you are using these ugly primitive cobbled together pipe guns and salvaged together energy weapons. You find prewar stuff but you can't maintain them long enough to rely on them. As your skill improves, you can repair 10mm Pistols and Combat Shotguns, but you can't modify them, and while the pipeguns and laser muskets aren't as good, they compete by being customizable. It's a choice if you want fully tricked out primitive guns, or old world guns with one or two modifications. And later game, if you level yourself up enough, or shell out the caps, you can wield the best that there was before the bombs dropped.
Instead pipeguns are worse than what you have after your first mission, and for the next 100 hours they'll never be more than the chaff you leave on raider corpses.