This is the first lip liner I have ever owned at I actually purchased it originally to go with on of my other dark red Topshop lipsticks (more on that later!) and actually I really love it. The colour is a dark red and I usually apply it all over the lips to which I then apply a lipstick too later.
Here is a swatch of the lip liner and as you can see it's a dark red, that could work well under most dark red/purple shades.
L-R Topshop Lip Liner in Deception and Topshop Lipstick in Wicked
The lipstick I always pair this in is Topshop's limited edition lipstick in Wicked. Unfortunately as I have wrote about this before, I don't think you can get this any more which is really unfortunate (I will try to stop going on about it all the time...) As you can see through the swatches, the colour match is great and really they work so well together. It makes the lipstick last longer on the lips and I always find it much easier to apply the lipstick on top of it. I'm sure there are other shades out there that'd work just as well with this lip liner and all it would take is a bit of searching. I wonder whether Topshop's Lipstick in Beguiled would go with it, it's likely!
Have you tried any of Topshop's Lip Liners before?