Can I extend my 30-day entry on arrival by 5 days at the Hua Hin immigration office?

A user is inquiring about extending their 30-day entry on arrival in Thailand by an additional 5 days. They are specifically asking if this extension can be processed at the Hua Hin immigration office located in the Bluport shopping mall. It's clarified that there is no option for a 5-day extension, but they may be eligible for a 30-day extension for a fee of 1900 baht, depending on their nationality (in this case, a UK passport holder). The user is also concerned whether the small Hua Hin immigration office can handle their request or if they need to go to Bangkok.