I originally subscribed to Ancestry but then found a lot of local records I needed were on Find My Past so I now have a subscription there as well.
In case you haven't found them yet -
The 1881 census is free in many places, as are BMD indexes on FreeBMD and the GRO's own indexes (though that doesn't include marriages, and their birth index includes mother's maiden name back to 1837 and age at death from 1837).
FreeReg is another free site though the coverage is limited.
Family Search is free to use though they mainly have transcriptions with links to images on subscription sites.
Depending on where your ancestors came from, there are also regional sites for places such as Lancashire, Cheshire, the Midlands, Cornwall etc. Though the only London records I've found are on Ancestry.
PM me if you need more info
In case you haven't found them yet -
The 1881 census is free in many places, as are BMD indexes on FreeBMD and the GRO's own indexes (though that doesn't include marriages, and their birth index includes mother's maiden name back to 1837 and age at death from 1837).
FreeReg is another free site though the coverage is limited.
Family Search is free to use though they mainly have transcriptions with links to images on subscription sites.
Depending on where your ancestors came from, there are also regional sites for places such as Lancashire, Cheshire, the Midlands, Cornwall etc. Though the only London records I've found are on Ancestry.
PM me if you need more info