Speaking to Daybreak, Margaret Hodge, Chair of the Public Accounts Committee said she would deal with overcrowding in classrooms by spending less money on education "vanity projects".
She said the Government needs to spend that money in stead, on investing on primary education for young children.
She added: "The start for a child's life is the most important, get it wrong and you might actually ruin the child's future."
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.