I bought the Models Own Purple Ash nail polish when I was ordering for the giveaway. If you're not already aware, the Car Key collection is Models Own's answer to the exclusive Chanel Khaki collection. I really wanted Khaki Rose but it had sold out before I had opportunity. Purple Ash seems to be the 'dupe' for Khaki Rose but I have a feeling it's more similar to the promotional pictures than the polish itself. Certainly the Models Own version is more purple than Khaki Rose which is more rosy brown in colour. You can see swatches of Khaki Rose on London Make Up girl's blog and on Karlasugar.
The polish applied quite well. It's a thick formula so I had to be careful to remove excess from the brush before applying. It wasn't streaky and was reasonably opaque after a single coat. The pictures below are with two coats.
It may not be a good dupe but I like this colour nonetheless. I love murky purples so this is definitely my sort of shade. As ever, I'm reluctant to make comments about the durability of the polish. I applied last night and as you can see there is some tip wear already. I didn't apply any top coat though and I'm forever washing my hands so this doesn't help.
I bought the Car Key polishes from the Boots website. You have to look carefully for the names: Grace Green, Becca's Brown and Purple Ash, as they are listed amongst the permanent line with no swatches.