For clarity, Openreach does not directly sell its services to the public. So if Openreach has announced new FTTP tiers on 16th Oct, it will be up to the ISPs if/when they will start selling them to the public. It could be today, next week/month/year....or never. You will just need to regularly keep checking the likes of BT retail with your line number to see what new products appear. FWIW Openreach announced new 500 Mbps and 1000 Mbps FTTP packages many months ago, but as of yet no ISP is selling them.