I agree with that when it comes to these types of threads. Sigged.
More seriously, keep Nelson preoccupied around Haiti during the summer of 1805, and so allow the Combined Fleet to break the blockade of Rochefort, and so head to the Channel where the Grande Armee is waiting to be picked up. The Channel has only a few ships patroling it (due to the rest either being in the Med, with Nelson around Haiti...
Once the troops are landed, then the question arrises, can Britain push them out, or can they then march (as Napoleon hoped) and take London...
If everyone practiced the strictest since of realism, why would this website/this specific forum be here?
I think the post is a valid question; I can see Napoleon trying to install a puppet/liberal government in power in London, and freeing the Irish.
I don't think that Napoleon was ultimately incapable of getting to Britan and winning a major victory, and London would not offer much more resistance than the army guarding it thanks to its lack of fortifications. You would just need an early PoD that changes Napoleon's focus from domination of the mainland to dismantling the British Empire. With said early change of focus, the French navy could be built up enough to stand a chance, less resources would be spent on the mainland, and Napoleon himself might even surprise everyone by turning out to be a good admiral. All it needs is a few tweaks to Napoleon himself, and we might well get the desired result. Or he could still chrash and burn, always a likely possibility with Napoleon
I'll just put it this way. ASsuming quality of the human element is compatible in both fleets for calculation's sake, despite that being very contestable.
Number of British ships of the line in 1790: 195
Number of French ships of the line in 1790: 81.
Also Britain was not as stables as many of you think I remember reading on this site a well exposed post about revolt and strike in Britain that could cause a lot of troubles at home for them. I can't recall who wrote it but it was quite interesting.