Cracked it!! there was an Orlando Hallet baptised 1774 Yeovilton, son of William and Elizabeth,but he died and was buried June 1777 , this comes up as a baptism, but is wrong, definitely burial. looking at the next page on the original, at the top of page in faded lettering September 1777 on 28th William and Elizabeth have another Orlando baptised, so she must have been pregnant when the other one died, and as was the custom!!! called the "new" one Orlando. The entry is very difficult to read, but am sure it is right. don't think it is listed anywhere. Hope this sorts his birth out, for you, and you can eliminate some of the records you have been looking at.