Finally, the Katy Perry for OPI is available in the UK (here). My package arrived and I was truly amazed by the colour. I only ordered Teenage Dream (might re-consider and buy Not Like The Movies). Teenage Dream is a sheer but buildable glitter polish. It has fine pink glitter and then larger, holographic, silver glitter. It is beautiful when it catches the light!
For those of you who don't want to shell out over £10 for a polish, you may want to take a look at Pink Fizz by Models Own. It has the pink glitter but no holographic glitter. I have been through a bottle of this already after obsessing over it around November/ December. It is a very close alternative for those of you who want the same look for less. (Also available here).