I have the pleasure of knowing the good Major and can confirm that he is far from muddle-headed even after copious quantity of beers! As for childish, the letter was written in his capacity as an MP based on first hand experience. He did erceive a mild admonition from Adam Ingrams for not directing it to the MoD, but the official response is lodged in the House of Commons Library (and thus is in the public domain) and has highlighted some deficiencies that go straight back to that department as opposed to the RAF which now need to be addressed.
Sometimes in politics the best route to addressing an issue is not the most obvious. You would be nieve to assume that Maj Lancaster isn't acutely aware of this.