Oh my giddy aunt! Birchbox have a 'make your own beauty box' stand at Selfridges. You get given a menu, and you browse and choose one product each from five categories, plus a bonus item.
I chose:
Skincare: Nuxe soothing and hydrating mask
Make up: mirenesse 24hr mascara
Nails: Seche Vite rapid dry top coat
Body: Rituals Ginkgo hand balm
Hair: Living Proof nourishing styling cream
Bonus item: this works deep sleep pillow spray
All in impressive sizes, the Seche Vite is full size and I think the face mask is too.
All for fifteen quid! No filler, all killer :)