The Post Office building and business in Castle Cary is for sale. There has been much discussion over the last 24 hours on social media in the town. Here is the link to the sale particulars:
https://runapostoffice.co.uk/home/result/show/castle-cary-post-office-castle-cary-ba7-7bp
So, at present there is no plan to close the business.
If there were a threat of closure, the Town Council would engage with all stakeholders and do its utmost to keep a Post Office in the town.