I'm sure I saw this in the handbook for this year. Is it quick? I used to have my 100 PB on an F1 course but I can't really remember how it compares with Hounslow because I was just faster at Hounslow and it didn't matter that the course was sub-optimal for me.
Yeah I think you're right but there's at least a version of something that uses similar sections of roads.
Edit - the F1B/50 is the one I was on about