In message , at 21:32:28 on Mon, 3 Jul 2017,
gremlin_95 remarked:

A picture has re-surfaced, that was posted online right after the fire -
showing a boiler apparently just inside a flat's front door. And loads
of copper *hot water* pipes. Also another picture showing what are
claimed to be cast iron pipes taking gas into individual flats from the
communal areas.

The former was one of the list of possible solutions to delivering
refurbished heating in the original feasibility study, and some sources
suggest the option chosen was a new heat-pump assisted *central* system.
If anyone has access to records of what was actually chosen, it would help.

Each flat had a heat interface unit (HIU) installed, in simple terms
these are heat exchangers; the primary side is connected to the
communal heat source (heat pump and gas fired boilers in this case),
the secondary side is connected to the apartment radiators. There is
also provision for instant hot water which is provided much like it
would be with a combi boiler. Heat meters work out the amount of heat
used by measuring the flow rate and temperature difference between the
flow and return. I am guessing the gas was for cooking.

Thanks, I think that explains it completely.
--
Roland Perry