Available to anyone with kids under 6 months old.
You have to call them up for it (or get them to ring you using the "Call me back" form on their site) so they're almost certainly going to try and persuade you to actually pay for something, but stick to your guns and you won't have to pay a penny!
The number to call is 0800 988 1076 - if calling from a mobile and you've got inclusive minutes, use http://www.0800buster.co.uk
to call them for free.
Hope this helps someone :)