David Cameron lobbying scandal deepens as one of his top civil servants worked for Green­sill while in Whitehall

DAVID Cameron’s lobbying scandal deepened last night after it emerged one of his top civil servants worked for Green­sill while in Whitehall.

The revelation came as Boris Johnson promised sleaze-busters would be given “carte blanche” — and furious MPs stuck the boot in during a fiery hour-long Commons showdown.

Former PM Mr Cameron bombarded Chancellor Rishi Sunak, other ministers and aides with messages asking for millions in Covid bailout cash for his employer Greensill Capital, which received nothing and collapsed in March.

Now it has emerged ex-top mandarin Bill Crothers took a role as an adviser at the finance capital firm in September 2015, while Mr Cameron was in No10.

The next year he quit the civil service and began work as a Greensill director.

But he allegedly failed to ask the parliamentary watchdog for permission — apparently flouting rules to stop civil servants cashing in on government ties.

Mr Johnson is understood to be concerned at the revelation.

He vowed investigators would get “maximum possible access” and that the solicitor heading the probe would be given carte blanche to “ask anybody whatever he needs to find out”.

Shadow cabinet ­minister Rachel Reeves said the Government needed to “get everything about the scandal out in the open.”