There are a few different ways you can check the stock of a product in the UK:

1. Check the product's availability on the retailer's website: Many retailers have an online presence and will display information about a product's availability on their website. Simply search for the product on the retailer's website and look for information about its availability. If the product is in stock, it will typically be available for purchase online or in store.

2. Contact the retailer: If you are unable to find information about the product's availability on the retailer's website, you can try contacting them directly. You can do this by phone, email, or through the retailer's customer service chat function if they have one. The retailer should be able to provide you with information about the product's availability.

3. Use a stock checker website: There are several online stock checker websites that can help you check the availability of a product at different retailers. Simply enter the name of the product and the website will display a list of retailers that carry the product, along with information about its availability. Some popular stock checker websites include Stock Informer and Stock Tracker.

4. Check the product's availability in store: If you prefer to shop in person, you can check the availability of a product by visiting the store and speaking with a sales associate. They should be able to tell you whether the product is in stock and, if not, when it is expected to become available.

By following these steps, you should be able to easily check the stock of a product in the UK. Keep in mind that availability can vary depending on the retailer and the location, so it's always a good idea to check with multiple retailers or check online to get the most accurate information.