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 22 June 2026. Ofgem Q3 2026 cap applied (gas 7.33p, elec 26.11p, gas standing 29.04p). Next scheduled review 26 September 2026 (Q4 cap publication). [ref V0]
By Oliver Wakefield-Smith, Founder, Digital Signet. Corrections to oliver at digitalsignet dot com.