I don't think they can be using ASL...?
www.bbc.co.uk/mediaselector/check/cbeebies/somethingspecial/signs/toilet?size=4x3&bgc=C0C0C0&nbram=1&bbram=1&nbwm=1&bbwm=1
Edit: Apparently they use 'Makaton' signs
( ,
Tue 15 Jul 2008, 14:24,
archived)
Edit: Apparently they use 'Makaton' signs