Alex and Steph head to north London to meet sales manager Kevin and estate agent Yolanda. This shopping-obsessed couple are out of control but are desperate to save some money for their upcoming wedding.

Having recently lost 16 stone between them, new-found confidence has led to a shopping obsession, with each of them buying new clothes to flatter their new frames. With four rooms overflowing with clothes, shoes and accessories, Yolanda can't keep track of what she owns, and her love of shopping means she just keeps adding to her ever-growing collection.

To show them the error of their ways, Alex and Steph go into their house and use their possessions to stock a pop-up shop. Yolanda and Kevin can't believe their eyes when they walk in and find their clothes, shoes, accessories and toiletries out on display. When they are confronted with the breakdown of how much they already own and how much they have spent, they are left shocked.

Alex and Steph set up their experiment, swapping Kevin and Yolanda's usual products for unbranded substitutes to show where they can spend less - but not all the products have been changed. Will they be able to spot the difference?

To really put Yolanda to the test, none of her clothes have been swapped. Instead, Alex has put together a capsule wardrobe for the week - all from Yolanda's existing wardrobes. It is time for Yolanda to get creative! Kevin's usual designer shirts and jeans have been replaced with money-saving alternatives, but will he know the difference?

Professor Avi Shankar talks about how we make our purchases our own and why it is important to go through this ritual. Alex visits British lingerie brand Rigby and Peller to find out what we should be looking for when it comes to bras. A group of gym bunnies put four razors to the test to find out which gives them the cleanest shave.

At the end of the experiment, have Yolanda and Kevin seen the error of their ways, and are they prepared to make the changes needed to save for their wedding? Show less