It was routine, pre-1992, with the advent of the Common Market, for source documents to have be signed in blue ink, to prove that 'someone' had not just photocopied a sheet from a previous consignment.
Ah that's why, tx, I didn't know that :)
@JWestland started
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It was routine, pre-1992, with the advent of the Common Market, for source documents to have be signed in blue ink, to prove that 'someone' had not just photocopied a sheet from a previous consignment.