Sounds like Bo&*%$ocks to me
If this is a true case then the CAA are lying inconsistent toss£$rs
(on the other hand........)
Seriously though I have an FAA class 1, UK CPL, UK FI and was told that coloured lenses are not permitted
If your friend has found a way around this then please ask him to PM me with a few tips
Hopefully !
Discretion assured