Hi
Unless you know the names of the churches where these marriages took place, the only way of finding the info is to buy a copy of the certificates
If the venue is known - the marriage can be looked up in the parish record for that church (saves the cost of a certificate)
If you happen to know the names of the father for John George and James Thomas, you can put a condition on your application that you only want it if father of groom was called .......
If it's the wrong one, they will only charge a search fee of £3 instead of the £7
It is not possible to lookup a birth in the same way