Working file V0
Retrofit installer comparison index (UK 2026)
Decision-aid comparisons that matter in 2026: Octopus vs Aira, British Gas vs Octopus, Heat Geek vs Octopus, coordinator vs installer-led, deep vs HP-only, EWI vs IWI, ASHP vs GSHP.
Surveyed 1 October 2026. Ofgem cap for 1 October to 31 December 2026 applied (gas 7.97p, elec 26.32p, gas standing 29.68p, elec standing 54.83p). Next scheduled review 25 November 2026 (January cap announcement). [ref V0]
By Oliver Wakefield-Smith, Founder, Digital Signet. Corrections to oliver at digitalsignet dot com.