Andy Furey is the National Officer for Communication Workers Union, which represents staff working in Crown Post Offices.
He told ITV News: "A Welsh town like Holywell needs a Crown Post Office. If we lose it, this could be the death knell for the high street in Holywell."
More top news
The first planting of the Woodland Trust's WW1 Centenary Wood is set to get underway in the Gwendraeth Valley, near Kidwelly.
This week Hannah is in Carmarthenshire finding out what is happening at the National Botanic Garden of Wales, 15 years after it first opened
A study funded by The Brain Tumour Charity aims to discover how long it takes on average for adult brain tumour patients to be diagnosed.