You do not need to take any action to convert your points.
As soon as you reach a certain threshold (for example, 300 points), a corresponding voucher (£15) is automatically credited to your customer account. Points are accumulated continuously: 300 points accumulated = £15 voucher, 600 points accumulated = £30 voucher, 900 points accumulated = £45 voucher, 1,200 points accumulated = £60 voucher, and so on. Example: 1,800 points accumulated = £90 voucher.
For example:
If you place an initial order of £350, you will earn 350 points. Once your order has been confirmed, you will receive a £15 voucher (as you have reached the 300-point threshold). You will then have 50 loyalty points remaining in your account.
If you place a second order of £1,000, for example, and use your £15 voucher, you will pay £985. You will thus earn 985 points. Your customer account will therefore have 985 + 50 points, making a total of 1,035 points. A new voucher worth £45 (300 points x 3) will be added to your account, and you will have 135 points remaining.