Baroness Thatcher has been admitted to hospital for checks after failing to recover from an infection.
The former Tory prime minister was forced to withdraw from a Downing Street reception to mark her 85th birthday last week after coming down with flu.
Friends said she was still being troubled by the illness, and aides called in a doctor to assess her condition on Tuesday afternoon. She was taken from her home to hospital shortly afterwards.
Conservative MP Gerald Howarth, a former aide to Lady Thatcher, said: "We all wish her well, and are sorry we did not see her last week."
