A 72-year-old woman with a history of heart failure (NYHA Class II) and chronic kidney disease (eGFR 40 mL/min/1.73m$^2$) presents with worsening ankle oedema and shortness of breath on exertion. Her current medications include furosemide 40mg OD, ramipril 5mg OD, and bisoprolol 2.5mg OD. Which diuretic adjustment is most appropriate according to NICE guidelines?