Penny has stepped in as an ad-hoc babysitter for me when my nanny was absent due to a family emergency. Not only was Penny very flexible, she was happy to jump in the deep end and nothing seemed to phase her. She was also very pro-active and was happy to take my 18month daughter to her regular toddler class and also do the school run for my son.
I would definitely contact Penny again as and when the need arises due to my nanny's absence etc.