Reeses Pieces are not commonly available in the UK. Therefore I have to rule them out. Of similar note, the same can be said of peanut butter M&Ms, I believe these were once a special edition or maybe I saw american imported sweets in the local shop again idk. Therefore the decision here comes down to M&M's or Peanut M&M's and frankly, smarties are superior to normal M&M's so Peanut wins by default.