The UK online marketing course market is genuinely confusing in 2026. You can spend £47 on a focused practitioner-led programme or £14,000 on a university MSc, and the gap between them is not always as meaningful as the price difference suggests. Free Google certificates sit alongside CIM diplomas that often take around a year to complete, and many comparison articles are either unselective or commercially biased, listing everything without a filter, or steering you towards whatever earns the highest referral commission.