Well looks like you're in luck.....
Looks as if Samuel & his wife Jane only have one child. William is b. abt 1863 and is with his parents in 1871 and 1881.
There is one possible William in the 1891, a single man, a saddler, age 27, lodging in Winchcombe, Gloucestershire, says born, Taunton, Devon. (Taunton is actually in Somerset).
Seems like William is a good bet for the father of Oliver.
Louise