From their press release:
Familyrelatives.com is pleased to announce the release of 5 million Parish records online. The database is a collection of historical parish and probate registers from many Counties of England and Wales dating from the early 1500s to the middle to late 19th Century. The records are available for viewing online and using new search technology, it allows leading genealogy website Familyrelatives.com to provide 5 million parish records which document baptisms, marriages and burials dating from 1538 to be searched more easily.
The Parish Registers are the Church’s official records of local baptisms, marriages and burials. The Registers date from Tudor times when a law of Henry VIII ordered all clergy to record this information in a register in church. Centralised Civil Registration was introduced in 1837 to provide one location covering all the parishes in the area, however the parish church registers provide the original source data to this day.
NOTE: Familyrelatives.com is a subscription service, but you can browse some of their records for free.