- Welcome to Walleroo Nannies, one of the most popular introductory Agencies for Nannies in London and the Countryside. We have been in the Nanny scene for over 9 years, with bases in Australia and New Zealand as well as London, so you will be in experienced hands. We include in our service a register which consists of Australasian and English Maternity Nannies, Maternity Nurses, Night Nannies and ...www.walleroonannies.com