So I really wanted to not do this mani as I'd never done it before and I was certain it would turn out a mess (bit like me water marbling) but I gave it a go and it wasn't as bad as it might have been.
Above is the link to the video were I learned what a one-stroke mani was. She made it look easier than I found it lol.
Nails Inc - Great Pulteney Street
Nails Inc - Piccadilly Arcade
NYC - Pinstripe White
Models Own - Black Nail Art Pen