Looking at the Undates OS Map, my 1830s tithe map and a modern map of the area (using Google Earth) to layer them I have come up with this rather startling result.
Here is the modern map, St Oswalds Church in Red. St Oswalds School in Blue.

Now with the undated OS map, probably late Victorian or early 20th C.

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Now the 1830s tithe map. Harder to make everything line up on this one...
As you can see, there have been buildings next to the church since the 1830s. So there is zero chance of the 'mass grave' being part of a Potato Famine related incident.
I've got some more thoughts on this... i'll post them up later!
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