I've always loved Parma Violets, so when Topshop released a nail polish with the same name, I just had to buy it, especially as I have a bit of a thing for pastel nails!
Here's a (terrible) picture of it on my nails;
It's a gorgeous colour in the bottle, a sort of bluish lilac. The first coat is very translucent and quite patchy, but don't be put off - the second coat makes all the difference. It's very easy to apply (quite a nice size brush, unlike some other brands) and it is long-lasting - I've been wearing it without a topcoat for four days now and it's only chipped once (middle nail, you can see it in my photo). It costs £5 for 8ml, so it's good value too.
I have four of the Topshop shades now (plus the matte topcoat) and will definitely be buying more!