Woodhorn is where the Northumberland Archives are based.
http://www.experiencewoodhorn.com/collections/ They hold registers and microfilm of registers for the county.
A few Rootschatters visit regularly and will often find the time to look up an entry if requested. That would tell you the details of the marriage (the good stuff like father's names and occupations plus witnesses etc as well as the barebones details)
Armed with that info, its possible to order photocopies of the microfilm entry or scanned images from the register. For marriages you are getting the image of the original register that was signed (not not, depending on the couple's literacy skills) on the day they were wed. Its usually around £1 plus postage for a photocopy from microfilm and £4.50 for a scanned image. Cheaper (and much more authentic in my opinion) than a civil cert at £9.25 a pop from the GRO, though a bit more involved as you need to complete a copyright declaration with your order.
If you can visit in person, you can look at the microfilms yourself and do a self service photocopy I believe, even cheaper :-)
Depending on the record, who wrote it, how good their handwriting was, if the person its about could read and write and therefore could be consulted about spelling, there may be lots of spelling variations/ interpretations for Murray, Murrow, Murrah, Morrow etc etc etc
Good luck with it.
Boo
