Eyeliner
Mascara
SPF15 or higher moisturiser every day of the year
Tweezers
Concealer.
For the best advice on which brand/make of products to use, I always consult Beautypedia.com. The woman who runs it, Paula Begoun, reviews hundreds of beauty products and rates them on what ingredients they contain and whether they're actually beneficial to the skin. It's surprising the claims that the big companies make about their products when in fact some of the ingredients used are irritants and can cause inflammation etc.
I always check whether Paula recommends before I buy any beauty stuff -she's my guru!! However, as it's American, sometimes I think the names of some products might be slightly different to UK names for the same thing. Anyway, just thought this info would be beneficial to all you beauties out there! 