it should be, but I've looked and I can't find it. There are a few John Jacksons born around 1898, but none with a Jean at his side. I looked on Ancestry; it's possible Find My Past have it, as they do their own transcriptions, which sometimes come out differently.
But I was just looking at Salford; they might have been anywhere at the time. Or they might be there and I somehow missed them. Such things do happen.
PS see my earlier post. I'm not convinced John died in 1935, there's no record of it in Salford. I suspect he died in 1955.