Cheers - but just noticed one of the white stripes is too narrow. Aaaargh dammit dammit dammit. Well, looks okay on the top of the wing so I think I'll leave it and put it down to experience. I have been using rattly tins of white and black and unfortunately precision respraying is not an option. The carpet in our hallway is gradually turning "primer grey".
Take it easy.....these invasion strips were painted in a messy way very often.That's true that their width should have been of 18 inches but the real painting was slightly different.So I'll let it be.