Ticking noise S Line at 80mph

[Bartonfink]

Hi all new to the site hope someone can help, got a 2013 s line it’s done 148k & generally it’s been fantastic. Sadly it’s developed a really annoying ticking/flapping metaly sound coming from the passenger side front footwell/door/window/glove box/floor...‍
I really can’t pin point its exact location as obviously I’m on the other side driving. It only happens when I hit 80mph (yes I know that’s over the limit but I’m on motorways daily & 80-90 is the accepted speed)
Looked under neath the chassis & all around the wheel area doesn’t appear to be anything loose or hanging off. Planning to take my son out tomorrow to see if he can hear it’s exact location. Any ideas be much appreciated. Jason

 

[Bartonfink]

Looks like I’ve lost a piece of the undertray by the passenger front mud guard which has loosened the screw on one side of the connecting undertray & that is vibrating at high speed causing the ticking sound Should be an easy fix, either tighten or replace the screw