Familysearch

https://familysearch.org is the site of the Mormon church (church of the Latter Day Saints) and a fantastic worldwide resource and it's FREE.

Once you get your line back to 1875 you can find births and marriages on familysearch for free. You don't get to see the original documents but the way the search works is better than scotlandpeople, in my opinion.

For example:

• it will recognise similar names so you don't need to have the spelling absolutely correct
• you can do a parent search
• the results give you the parents where the search results on SP just give you the name so you have to pay even more credits to get the document which may turn out to be  the wrong person.
• you can also search by Batch Number more on this next time