Primark is a very cheap store - t-shirts for £2, trousers for £8 etc. It is fast fashion so stuff changes rapidly and frequently. If there is something on the catwalk at a fashion show that causes a lot of interest or someone famous wears something particularly noteworthy in a magazine photo, Primark will have something very similar to it in their stores within a week or two. Primark is hugely popular in the UK and elsewhere in Europe. Tourists at the central London stores (which are HUGE by the way - the size of a typical department store of years past) literally flock there.

The shopping experience is often chaotic (clothes strewn all over the place) and quality is generally not thought to be great - stuff might last only a few washes ... but it varies - I have a generic blue hoodie from Primark that cost less than £10 but it has lasted literally years and has some high quality features like the ends of the draw strings are finished in metal (not plastic and not just tied) so have not frayed or come apart. I don't think their quality is any worse than other high street retailers though - often they charge 3x 4x or more prices for equivalent quality.

I will certainly be using this guide in the future to pick the finest Primark has to offer!

Search results revealed that Primark is a fast fashion retailer, so probably selling the low end junk.