chris_49 - FindMyPast are well within their right to change the way the search works, in my opinion. Allowing free searches is a way to entice people to buy credits, not as a means of free information. They've got to make money, after all! However they've got to provide enough information for people to be sure they've got the right household, otherwise people will be reluctant to spend their credits.
Anyway, that's just the way I see it...
EDIT
Sorry, didn't mean to sound ranty. I've been finding out loads of information from the free searches, and haven't bought any credits (yet). But I don't begrudge FindMyPast for needing to cover the extensive costs of hosting the register.