There is a wealth of choice at this end of the market and with this budget, so it is a matter of deciding what specific requirements are most important. One option would be to replace it with a newer Fiesta - for £12,000 you would have the option of 2024 models or slightly older 2023 models with a higher specification. Fiestas of this age have the mild hybrid version of the EcoBoost engine which has a timing chain rather than a wet belt which is good news for used buyers, and it remains one of the most fun to drive cars in this segment. If space is a priority then the Honda Jazz would be a sound choice. It is impressively spacious inside despite its small footprint, has a very efficient petrol hybrid powertrain and a very strong reliability record too. You could also look at cars like the Skoda Fabia and SEAT Ibiza, which are generally well-specified, have good reliability and a choice of efficient turbocharged petrol engines.