stopgap those brands are available here. Although the selection of Free People at asos and Selfridges is not good, so I tend to buy online.
OP, I like Odd Molly, Free People, All Saints, Hoss Intropia (the place to go for understated evening and party wear), HIGH by Claire Campbell (sale purchases only, too expensive), Maje, Sandro, Zadig & Voltaire, Claudie Pierlot, Manoush and Sybilla
For basics, jeans and plain tops, Zara, Bershka, Massimo Dutti and Boden.
I'm mid-40s, work in fashion/publishing and I've been told many times I'm very stylish. In a colourful way, not everybody would wear what I wear...
I also customise some clothes and accumulate garments; today I'm wearing an embroidered gilet bought in Hyper Hyper in the mid 1990s. I love all my clothes so keep them forever... Just in case. Only unloved items get the kick.
I sometimes worry I dress too young for my age but... I like it this way.