Well...I managed to find a bit of time to have a go at making my own version of under spoiler graphics.
I started by working out what I wanted sizewise and shape (the spoiler is curved in section as well as in plan form, so for me, the graphic had to have a curved profile to it.
I did a trial run using a print from my office printer (that's the photo with the car in my garage) and I found that I didn't like the visual clutter on the underside of the spoiler which was distracting from the look of the graphic, so I decided to paint the underside of the spoiler satin black prior to fitting the final Union Jack decal, which I hand cut out of Scotchcal.
The blue and the red have a satin/matt metalic finish and the white is non metalic slightly glossy.
Conclusion.....well, i'm not sure that the photos do full justice to the finished article, but either way, i'm pleased with finished result.
2014 V6s convertible Rhodium Silver with Propeller alloys & black interior.