How far will the levy actually go?
You know the Cabrach exchange - serving well under 50 premises. That would probably need 4 or 5 cabinets and major ductwork to install them. Say £50k per cabinet and 10 potential users. With a 50% uptake just 5 per cabinet meaning about £10k per user.
50p/month or £6 pa - after admin say £5 meaning it would take 2000 existing users a year to pay for it.
M H C
taurus excreta cerebrum vincit