You can pay for your order in instalments by select PayPal Pay in 3 as the payment method when you check out. PayPal Pay in 3 lets you split your purchase into three interest-free payments. Find out more here: https://www.paypal.com/uk/webapps/mpp/paypal-payin3
Pay in 3 is payment option is offered by PayPal, so eligibility along with terms and conditions are managed by PayPal and not Hewi. This payment option is also only available to UK residents.
For more information about how PayPal Pay in 3 works, T&C's, late fees for missed payments, visit: https://www.paypal.com/uk/webapps/mpp/paypal-payin3/faq