Parma Violet - 17
(You'll have to excuse the tan on the knuckles haha)
I LOVE this colour! People usually only stick to pastel shades during Spring/Summer, but I'm all for wearing whatever shade you fancy during any season.
This is 17 Lasting Fix Nail Polish which retails at £2.99. 17 often have 3 for 2 on their range as well.
I have a few of their polishes and I absolutely love them.
I can't comment on staying power as I always have Acrylics and any nail polish lasts forever on Acrylic Nails.
17 Can be found in Boots stores & Online :)