Glitter Gal is an Australian brand that I've seen featured on quite a few (usually non UK) blogs, they're not that easy to find over here. Their holos are amazing! The polishes are also 3 free (they don't contain Dibutyl Phthalate (DBP), Formaldehyde and Toluene).
I was recently sent Dark Purple to try - it's absolutely gorgeous and is a true, linear holographic polish. Pretty! I'll let the pictures do the talking:
Application, drying time and longevity were all great for me. I tend to find holos dry quite quickly, and I tend not to use a topcoat with them so as not to dilute the holo effect. Based on this polish, I would definitely purchase more Glitter Gal polishes in the future - Silver, Fuschia, Black and Light as a Feather are my other favourites in the Glitter Gal Holographic collection.
Glitter Gal polishes are available in the UK from Sjmwell Nails & Beauty or you can follow on Twitter at www.twitter.com/sjmwellnails