Well one constant definitely is this brand George. It's super cheap at £1.75 and the formula is very good for that price. I got 3 new colours as part of a swap and I wanted to swatch them since I have a hard time finding swatches online for this brand.
More like NYC cab yellow, but I can see why they named it that :)
I personally am not too keen on these colours, but that's just because i'm a bit hard to please when it comes to colours these days, but I have no complaint about the formula. Groove is slightly sheer and needs 3 coats, where as the others just required 2.
But if you are looking for a cheap thrill, these polishes are it :)