Highland (Mainland) forum 8 room
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Here's where you can read the PSAS article on the cross (small pdf file)
http://ads.ahds.ac.uk/catalogue/adsdata/PSAS_2002/pdf/vol_090/90_246_250.pdf

Drawing and more background detail.

I'll check out Allen & Anderson to see if they add anything and get back to you.

No, very little in A&A. The PSAS article is the best source.