"A contractor of my employer asked me to contact another member of my organisation to persuade them to do something commercially advantageous for them" - at no point is anyone here a consumer.

Business emails are subject to fairly different rules by the looks of it: https://tietosuoja.fi/en/faq-direct-marketing ("Can a person working in a company be sent direct electronic marketing") - it appears there's a fair bit of an exception that doesn't require consent.