By Jess Jones The British government is spending £1.5m on a marketing campaign to turbocharge the nation’s science and technology sector, aiming to spark a surge in investment in UK-based tech ventures. Tech Secretary Michelle Donelan is set to announce the fresh campaign during atechUK conference in London today. The initiative is urging UK investors to back science and technology scale-up businesses, specifically those at Series A-C level and beyond. The global investment downturn last year dealt a significant blow to UK scale-ups, leaving them scrambling for much-needed support. While the U…