It's Sod's Law at its very finest; I've just bought a Skinceuticals serum and eye cream from Beauty Expert, and they release a 20% off everything code the next day.
The promo code is NO1DAD, and is for Father's Day. It seems to work for all items, not just the stuff for men, although it does exclude vouchers, sale items, Tria, Reviber, Clarisonic, Philips and ghd brands. The code can only be used once per customer.
If you do actually want to get stuff for your dad with it, I recommend Miller Harris Feuilles de Tabac, Citron Citron or Terre de Bois eaux de parfum, or the Anthony Logistics skincare range.
The website is at www.beautyexpert.co.uk.