Instructions:20% off £40 spend or more @ Smashbox online. Code TREAT (ends 2nd Oct).
I also had a pop up when I went on website for £5 off for new customers. All I had to do was click on pop up and £5 off automatically added to checkout.
The 20% off works on top of the £5 off.
Free delivery and 2 free samples with each order.
Edit: Save £5 code is SAVE5