KCTMO

Managed social housing in Kensington & Chelsea since 1996

Not-for-profit company.

Chief executive: Robert Black

Artelia UK

Max Fordham

Project managers for Grenfell Tower refurbishment

Cites Grenfell Tower as a case study.

Specialises in cost management

Building services engineers hired by KCTMO

Advised temporary removal of ‘fire stopping’ was an option.

Did not return requests for comment

Studio E

Rydon

Architect overseeing the refurbishment

Website does not appear to be working.

‘Deeply shocked and distressed’

Won £8.6m contract to refurbish Grenfell Tower from KCTMO

Made a profit of £14.3m last year, on turnover of £271m.

Sub-contracted multiple other firms to work on the project

Harley Curtain

Wall/Facades

Witt UK/PSB

UK arm of German ventilation firm Witt & Sohn

Has removed references to Grenfell Tower from website.

Makes ventilation systems that extract smoke in a fire

Won £2.6m contract from Rydon to install cladding

Has provided cladding for other London tower blocks.

Part of company went bust after Grenfell work

JS Wright & Sons

Celotex

Birmingham-based mechanical engineers

Was contracted by Witt UK to work on ventilation systems.

Made a £3m profit last year

Provided RS5000 insulation for Grenfell Tower cladding

Insulation has high fire safety rating but can still burn.

Owned by French firm Saint-Gobain

Arconic

Manufactured Reynobond PE used in cladding

Makes a more fire-resistant type, Reynobond FR.

Reynobond is made in Eastman, Georgia, USA