I bought 100m of starter cord from eBay for £8 - it's more wear resistant than paracord, stretches less and is rated at about the same strength. I'd wager that the Poundland "paracord" is 50 feet, not metres, and although it's fine for general use, it's pretty poor quality
Actually the cord I used to make the bow was starter cord from a petrol strimmer lol