At least 80 people were killed in the blaze that consumed the tower this month, with the cladding blamed for spreading the fire throughout the 24-floor block.

An "urgent nudge email" sent to contractor Artelia UK from the Kensington and Chelsea tenant management organisation (KCTMO), which runs the tower block on behalf of the local council, said that "we need good costs" for council deputy leader Rock Feilding-Mellen.

One suggestion was the use of aluminium panels instead of zinc, which is more fire-resistant, leading to a "saving of 293 368".

Retired judge Martin Moore-Bick was on Thursday appointed to lead a public inquiry into the fire, which engulfed Grenfell Tower on June 14.

Residents have expressed anger at the authorities' handling of the fire, leading protesters on June 16 to storm the town hall which manages the social housing block, though there is no suggestion that fire safety concerns were ignored.

Earlier in the day Robert Black, chief executive of KCTMO, also announced he would resign in order to "concentrate on assisting with the investigation and inquiry."

Victims identified so far include a six-month-old baby, her eight-year-old sister and their parents, who lived on the 20th floor.

The baby was found in her dead in its mother's arms.