DeepC I've used
the 1837 BMD index for a fair bit of research. It is very like being at the Family Record Centre because what you view are scans of the register pages. Once you have found the record (you think) you want you can then order it on-line and wait for it to come through the letter box 5 days later. Very efficient. Remember it is a pay as you go service and your unused credit will ultimately time expire.
Have you thought of purchasing the complete 1881 census from the Mormons? Something like 25 CDs in a bound wallet for about £30. Absolutely invaluable and will get you off to a head start.