So it turns out I lied, my brothers car has some minor lifting and dirt on the edges. However this is only on a couple of corners and is hardly noticable, unless you get a bit of wash mitt stuck in it. There are no chips on his film, he has a full front end and A Pillar protected. His car rarely gets washed, so would be a good indication if the PPF was collecting dirt on the edges. Photo's below showing the condition, red car.
Interestingly my car has no lifting and the film is of similar age, however my car has about 7 or 8 chips in it whereas my brothers car has no chips. The chips are only noticable from around 2m away, any further and you can't really see them.
Please note my car gets used daily and for around 10 trackdays a year.
Film on both cars is around 4 years old.
Commented photos below.
Lifting edges:
View attachment 4133
View attachment 4134
Film edges - No lifting:
View attachment 4135
A Pillar Edge:
View attachment 4136
My car, there is a collection of chips on the leading edge's of the bottom of the bumper.
Chips (any other spots you see are just water marks)
:
View attachment 4137
Film edge - No lifting:
View attachment 4138
You may notice my car has a front splitter and there are 4 chips directly above this. I'm not sure if the splitter is acting like a hoover on any debris, which might cause this collection of chips. Splitter was installed 3 months after the PPF application.