You need to call 0845 200 6745 (local rate) and give them your name, address, phone number and nappy size required.

Office hours are between 9am - 6pm so if you don't fancy speaking to a real person call after this and leave your details on a specially recorded machine.

http://www.spiritofnature.co.uk/acat...oltex_faq.html

Can I try a nappy before I buy?
Yes! We want you to be happy with the nappy you choose – babies come in different shapes and sizes! If you are unsure about which size your baby is currently in, just let us know and we can send you 2 different sizes to choose from. Be guided by the weights given in both lbs and kgs for the four sizes we stock – MINI, MIDI, MAXI and JUNIOR.
Simply call 0845 200 6745 or click here to order your FREE sample.

Although click here doesn't work on their site!