Aldi is offering people a free £100 to spend in their stores if they sign up to be a mystery shopper. And let’s face it, £100 in Aldi will go a long way! The review website, UK Mystery Shopper has just posted the offer online and it seems that just about anyone can apply. Once you’ve entered your details, UK Mystery Shopper will get back to you to let you know whether or not you’ve been successful and can take part. If you are accepted, you’ll be given £100 gift card to spend in Aldi.