UK Deputy PM fights to save her career after admitting underpaying tax

• Rayner admits underpaying tax on new home
• She refers herself to government's ethics adviser
• Opposition politicians call for PM to fire her
• Starmer offers her his support

LONDON, Sept 3 (Reuters) - British Deputy Prime Minister Angela Rayner was fighting for her political future on Wednesday after acknowledging she had underpaid property tax owed when she bought an apartment in a southern English seaside resort.