I suppose it wouldn’t be too much of a stretch to use balance mod NOs in our games instead of what we have had. However, not giving Germany a NO for control of London just won’t work for us, I know that this one may be on the block for consideration… and I think you should find a way to make it work. There was a plan to conduct this operation, so avoiding an NO would be grossly inaccurate, and Germany capturing London encapsulates everything a “national objective” is suppose to represent.
In our group, I offer a 5 IPC national objective, a victory objective that will help them win the game, and a free R&D breakthrough… all that and we still go for Moscow instead of London (not to say our guts measure up to those in the league). There must be some middle path, if the difference between going for sealion and not is a 5 IPC swing, I think we would see more sealion attempts even without the NO.
So we should talk about this, and you can take it to your mod squad…
5 IPCs for control of London, or if the London major IC is unoperational (or maxed if you prefer).
That way they can get their 5 IPCs in a way that relates to the battle of Britain (via or Sealion) without having their arm twisted to do “the obvious”, or is this more about Churchill not sleeping at night?… If so, than just balance it with something else for the allies, but a NO for London is a no brainer.