Several reports say a significant number of people hold large amounts in UK ISAs and that leaving money in cash inside an ISA can reduce its effective value over time. One outlet states that more than 1.5 million people have at least £100,000 saved in an ISA. The articles caution that cash returns may not keep pace with inflation, meaning the purchasing power of the savings can erode even if the nominal balance remains unchanged. The reports also advise readers to review how their ISA money is invested and consider steps to improve returns, framing inflation risk as the key issue with holding “too much cash” in an ISA rather than investing through instruments that may offer greater growth over the long term. The overall theme is that ISA savers should check whether their ISA type and cash balance match their goals and whether returns are sufficient to protect against inflation. The coverage does not identify any single ISA account change mandated by regulators, but it focuses on personal decision-making and the potential impact of inflation on cash savings.