On each product page on the website, you can use the 'check in store' feature to see if there are any colours and sizes available at a store near you.
When on the product page, just select the size and colour you want, and hit 'check in store'. Then enter your postcode and search, and you'll see stock levels in the stores near you. Please note, if an item is out of stock online, you can still pick it to check the stock levels in store.
Please note that you can check in store stock levels regardless of whether your selection is showing out of stock online - just follow the same process.