By Sarah Tetteh Prince William has shown ‘strength of character’ and is determined to ‘hold the fort’ amidst King Charles and Catherine’s health woes – as Prince Harry ‘offers to return,’ if called upon, say royal sources. The Prince of Wales made a statement as he attended his wife Kate’s favorite show the BAFTA ceremony alone for the first time in years without her by his side, as she recovers from abdominal surgery. Insiders say Prince William, 41, is determined to soldier on despite the recent health troubles his family have faced. His father King Charles was diagnosed with cancer just wee…