I hesitate about posting shots of the interior - I'll have to wait an association - but this is from a website which suggests that some of it is even earlier.
"The earliest parts of this building date back to the mid-13th century - a time when there was relative peace on the Anglo-Scottish border and funds were available from the marriages of successive Washingtons to wealthy widows. Parts of it remain. The most obvious being the pointed arches at the west end of the Great Hall, which could have been part of a screen passage arrangement connecting the hall with the kitchens."
Ah.
Fascinating.
Gothic arches fused with a later Tudor building (again, at a time of relative domestic peace and increased prosperity).