2014 Mk4.5 Graphite 2.0ltr 140hp Ticking Noise

Good Morning, Hope everyone is well, So I have owned a mk4.5 2.0ltr 140 mondeo for over a year it has 13K on the clock, returning from offshore one trip took the car out for a run, after about 20-30 minuets of driving I pulled over and noticed their was a ticking sound coming from the foot well of the passenger side of the car, lifted the bonnet but could not hear it over the engine idling but when back inside you could, it gets faster on revving the engine then returns back to a slow tick on idle, its only happened twice in the last few month and only when the engine is at temperature, hopefully someone has had the same experience before it get put to the garage to investigate,

Thanks Grant