Hello JAP,
as I recall from a few years ago, I had to supply an e-mail address and password to register with Ancestry in order to access the England/Wales BMDs and 1881 census. No credit card details were asked for this free registration - just name and e-mail address. A password was sent through, which I changed on my next access.
There is a link "Password (Forgot?)" for Ancestry to send your password if you do not remember the transaction.
Regards,
John