Yes - it is a regimental pattern.
BereniceUK wrote: It does look odd, I agree. I wonder if the 12th Royal Lancers had similar plaques for all their ABW fatalities? As to what it's made from, all I can answer is some sort of metal which has become a little discoloured in places, especially in the lower two corners. The wall seems to have been replastered around the plaque (it's in the church porch).
UKNIWM simply describes it as "metal."
www.ukniwm.org.uk/server/show/conMemoria...8/fromUkniwmSearch/1