Climber-of-rocks

HI All,

05 plate
97K miles
uprated starter motor stock other wise

Coils, lead and plugs all done >2500 miles ago.
Oil and filter at same time
De clogged CAT - Absolutly nothing in CAT

Experiencing the following:

Loss of power when warm above 5000rpm
Loud noise similar to that as if there was a hole in the exhaust close to the engine
-note I have been over every inche of the exhaust & can't see/feel anthing)
Clicking / ticking noise from LH sidee of engine bay - may have been there previous

When cool power is good and pulls well
Noise and power loss gets worse as she gets hotter
If left for a day or more on start up seems like there is nothing wrong untill starts warming up.

Had a P0120 code a bit ago but has seemed to clear itself (throttle body position sensor)

Video below if it helps:


Please anyone have any ideas?