How can I re-enter Thailand with my new passport while retaining my old visa and permits?

When renewing your passport while having your visa and permits in your old passport, it's important to manage the transition properly. When entering Thailand, you should carry both your old passport (with visa, extension, and multi-entry permit) and your new passport. It's advisable to inform the immigration officers about the valid extensions in your old passport. Depending on the situation, they may transfer the necessary stamps to your new passport or guide you on how to handle it at the immigration office. Additionally, ensure you request that your old passport be returned to you after renewal in the UK.