Milla, some brands I didn't recognize are: Elemis, Models Own, Nail Rock/Lip Rock, Paul's Boutique, Percy & Reed, Cowshed, Figs & Rouge...and quite a few others, actually. I can't be certain that they're not sold anywhere in America, but I haven't spotted them in the places I shop. Maybe I need to get out more?
With regard to price comparisons on brands that are available in the US, too, here are some: NARS blush is priced at $37.60 on asos.com and is $28 at Sephora; Fekkai Color Care Shampoo and Conditioner (8 oz. size) are each priced at $23.99 at CVS (US drug chain) while the same products in 2 oz. size are priced at $12.53 each on asos.com; Illamasqua lipstick is $27.75 on asos.com and $22 at Sephora; and an Essie polish priced at $17.82 on asos.com is available for $8 at CVS.
I loved the drama of the Illamasqua line (teal lipstick!--couldn't wear it, but still) and the fun names of products in the Cowshed line (Horny Cow Seductive Room Candle