I'm a bit surprised that no-one has come back on this yet, but I've just had a little look and am wondering if you need to consider surname variants.
All the above baptisms (the first in Little Leigh, the others in Lower Whitley) give the residence as Dutton, which is in the parish of Great Budworth. Looking for marriages there I've found one in 1781 between George Brockilow and Ann Fryar, both widowed. (There was also one for a Thomas Brockilow on the same day.)
Looking in the registers (they're at FindMyPast) there are a lot of entries for Brockilow/Brockelow in Great Budworth - it may be that with the baptisms in other parishes the minister wasn't familiar with the name and wrote what he thought it was. Among others in Great Budworth I noticed burials of the wife of a George in 1780, George in 1775, and George aged 78 in 1814, all from Dutton.
You didn't explain how you arrived at George's birth in about 1761. Sometimes you come across estimated birth dates based on a supposed average age at marriage, but this can be very hit and miss and shouldn't be relied on.
Hope this helps.