Nails inc - Chester Street is a warm grey pearl. Nails inc describe it as a pearlescent mushroom which is about right...
This is one of those shades that varies in warmth depending on the light but I'd say the bottle shot and final pic are most colour accurate.
It's also described as a metallic version of Porchester Square, in my book this is no metallic but it does look similar and could be a pearl version - I'll have to dig mine out to compare.
Swatch shown is 2 coats, no top coat.
Application was ok, as you'd expect for a pearl finish it's kinda brushstrokey but nothing too bad.
Chester Street isn't a current Nails Inc colour but you can pick it up from BeautyBay for only £8.91