I think you can get it also at Mothercare, but i agree with benjy, you don't really need it! We clear the baby trash daily. If it's pooh-pooh, the soiled nappies does directly to the bin outside.
Around 6 months, when baby can sit well, you can try putting baby on toilet and flush the mess away. You need a potty cushion and hold the baby securely over the seat. We did this 'training' twice a day, at the same time everyday, usually after a meal. It's great way for us LAZY MUMs to get out of cleaning really messy bottoms....