What’s the catch – there must be hidden costs somewhere?

I understand this concern completely. The only “catch” is eligibility criteria – you need to qualify based on income, benefits, or council tax band. Once approved, there are genuinely no hidden fees, no monthly payments, and no debt created. The government schemes are audited and regulated, so companies can’t add surprise charges. Your only commitment is allowing the installation to happen and maintaining reasonable access for any follow-up inspections.