Once you have a loyalty card linked to your shopping account, your points balance can be shown in the 'Payment options' section of the checkout, by clicking on 'CHECK POINTS BALANCE' or you can check it any time here.
When you shop, you can choose to redeem your points or keep them for next time.

Your points balance explained

Every 100 points are worth £1.

When your balance reaches 100 points, we'll convert it (overnight) to £1 for you to spend.

For example, if you have collected 454 points, your balance will show as £4 plus 54 points.
You can spend the £4 and the 54 points will stay on your account.