If you're like most UK business owners, you probably dread dealing with business energy contracts. The paperwork, the jargon, the worry you’re overpaying — it’s easy to delay. But with April 2026 coming, waiting could cost your SME thousands. Here are the 7 most common mistakes UK SMEs make with commercial energy contracts — and how you can fix them now. Mistake #1: Missing Your Notice Period Missing your supplier’s notice period means you’re usually rolled onto rates 50–70%