Regarding the new Sea Vixen kit, I’m pleased that Airfix have started to reintroduce its RAF roundel decals complete and not produce them with a separate red dot, which were a nightmare to accurately position them on a model, and was one reason why I gave up model making.

Ironically that started in the early 90s, I think initially by Revell and then Airfix, simple because so many modellers preferred the spots separate, and because it was easier over such a large print run to get more sheets that were usable. Even today many of the specialist decal companies prefer to split things like roundels down as an extra insurance measure against slight shifts in registration.

Centering them is not that difficult, a bit of setting solution to float it in place, then pad it down with a cotton bud.