"Use the Narrow Route Brief. That does precisely what you want.
It wants to know:-
A briefing ID - anything you want - it's for your reference.
Where you are going from
Where you are going to
How high you are going to fly.
Except that it requires me to log in every damn time, it has that stupid arse-about-face way of entering the time and date (why no drop down?), it doesn't understand aerodromes without ICAO locators, it doesn't seem to allow intermediate waypoints to be entered in lat and long (or if it does, it isn't obvious), doesn't display the results on a printable map....
And quite what exclude NOTAMs with effective date earlier than () days. (Range 1-999, leave blank to include all) means, I don't know. Why not use the date?
Sorry, it needs to be better.
How do you enter "I want to fly from Enstone to Bourn via the Olney VRP tomorrow at 2500ft and want NOTAMs to cover 10 nm from track from 0900 to 1700"?