Hi trumpet
Now that maiden surname Cowling does come up on some births for Marshall children.
Cowling is also a well known name to parts of Rawcliffe nr Goole. Rawcliffe registration came under Goole, maybe that is where they may have lived. I know that Rawcliffe records are held at Goole library uptil a certain date, lets hope they go into the early 1900's.
Off to the library on Saturday, was going tomorrow, but I have to await a delivery, but if it arrives early enough I will trot to the library for you tomorrow.
Do you know if Stanley had another forename

I cannot find a marriage for a Stanley Marshall to a ?? Cowling, this could be possible that they didn't marry or that their names have not been transcribed correctly etc.. Will have a better look on sites later.
There are 3 births listed for children born to a Marshall father and Cowling mother Annie, John F & Stanley. Hopefully if they were baptised there will be records, just hope the fische covers these dates and gives us the mothers forename.
You are doing well with the comp, at least the messages are being posted and readable, if you get stuck just ask for help.
bendywendy