Comments made by Easy illustrate my point. He obviously thinks (with some justification) that Trafalgar is perhaps the most significant campaign. Mention that to a veteran of WWII and he'd laugh his socks off. Mention it to a younger guy and he'll ask you who Hitler was.
Obviously, history is regarded differently by different people. The BoB (and presumably the bombing offensive, given the Lancaster's inclusion) are important events. But so are many others, so it's absurd to commemorate one without doing the same for others. So, like I said, it would be more sensible to just abandon the notion of having an official historic flight. No matter what you did, it would never include all the aircraft that could lay a claim to being in it.
As for the Mosquito, it's a nice idea but it's never going to happen of course. The RAFAT will probably be gone in a few years when the Hawks run out of hours. Doesn't seem unreasonable to assume that BBMF will go at the same time.