Thank you for your feedback.
We take our delivery charge of £35.99 as a part payment for the delivery, and it is often more than double or more.
As we do not have our own fleet of transport, we do not profit from the charge at all, just try and keep it as fair as we can with everyone paying the same charge.
If in future you need help with measuring, sizes etc, please do not hesitate to call, where the staff will be more than willing to help out with this. As you said this can be expensive to return.
Hope you love your new floor, and would love to see some pictures or the finished result.