By Jessica Frank-Keyes According to reports, Thames Water’s backers are devising backup plans for a renewed injection of cash in a bid to prevent the firm from being effectively renationalised. The UK’s biggest water company is struggling under an £18.7bn debt crisis, and is in talks with lenders to provide it with fresh funding. The floundering utility firm is reportedly working with Rothschild’s financial advisors and approaching specialist infrastructure investors for the equity raise, the Financial Times (FT) reported. This is in a bid to fund investment across the water network and addres…