I'm in agreement with Sovereign on pretty much every point.
Yes, get rid of the slash in the zero.
(Though I do like the "Since 2013" part - every company had to start somewhere at some time.)
Yes, reveal the printer. Honestly, how many playing card companies exist in the UK to start with?
Don't specifically limit yourself to 100 decks. Mention that as your target, but have the flexibility to print more in the event your deck becomes a success. It's a classy design that could have broader appeal than just card collectors. And if deck runs are cheap enough, consider a second color of the same design - poker players love a matched set.
The labels on the front... One says "Grain Deck", the other says "Grain Back Deck". You're essentially saying the same thing twice. Why? Change "Grain Back Deck" to "Grain Back Design" and that will make more sense and eliminate the repetition.
Consider a deck seal as well - doesn't need to be custom, just needs to be enough to keep the deck closed. It's tradition in the US, dating to when the government charged taxes on playing cards - the deck had to have a tax stamp sealing it shut before it could be sold. If not a seal, use cellophane - one way or another, it will show a collector that the deck is in new, unused condition.