Brown faces grilling on 'secret' cash donations ; Prime Minister Gordon Brown was to be grilled today over pounds600,000 of "secret" donations to the Labour party.

Prime Minister Gordon Brown was to be grilled today overpounds600,000 of "secret" donations to the Labour party.

He was to face questions at his monthly press conference justhours after the party's most senior official quit.

General secretary Peter Watt resigned after he admitted knowingthat a wealthy donor had hidden his identity from regulators.

Mr Watt's departure was another low point for Mr Brown who hadalready suffered his worst week since taking power in June.

The loss of millions of child benefit records, the ongoingNorthern Rock crisis and attacks from former army chiefs have leftLabour reeling.

The latest problem could revive …