Nude's Advanced Renewal Serum has just gone on sale in Space NK and is worth checking out.
An updated version of their original Advanced Cellular Repair Serum, it's suitable for all skin types but if you have combination/oily skin in particular, this is a water based 'light-lotion' textured serum and might be more comfortable for you if you feel unsure about/are put off by oil based serums. It's perfectly comfortable for drier/sensitised skins also.
It's too early to give feedback about the results with only a few uses under my belt, but it absorbs easily, is very light in texture and works with all moisturisers. Ingredients include probiotics (obviously), polypeptides, omega 6/9 and hyaluromnic acid and sea kelp to aid hydration.
Skin is definitely glowing and comfortable after application and it's not in the crazy-priced area of £200+ for a serum - it's £68.00 for 30ml.
Available from all Space stores and online at www.spacenk.com