The ceremony is underway as the Queen is set to formally name the Royal Navy's largest ship at Rosyth Dockyard in Scotland.
The Royal Navy has tweeted:
More top news
Climate change is a pressing issue for Tonga, but has it had the attention it deserves at the Commonwealth summit?
With temperatures peaking at 29C today, it is the hottest April day for nearly 70 years.
Russian trolls are behind a disinformation campaign about chemical weapons attacks in Syria and Salisbury, a government source has said.