Think again Ivor. And think harder.
A link between the 2nd and 3rd busiest airports in the UK is hardly unlikely, given the onward connections that could be travelled via either MAN or LGW.
In many European countries of lesser or comparable size to the UK, connecting flights between major airports (not only cities) is standard practice, whether it be Lyons to Orly/CDG, Milano to Roma (take your pick of airports from either), or Frankfurt to Berlin.
What drove you to make such an asinine comment Ivor?