The UK and Norway will operate a nearly identical Type 26 frigate design, offering commonality and joint command prospects.
New images of HMS Glasgow show the Royal Navy's first Type 26 frigate taking shape on the Clyde as the 8,000-tonne warship moves closer to sea trials.
HMS Birmingham is the fourth of the anti-submarine warships being built in Glasgow.
The bow section of future frigate HMS Birmingham has arrived on the River Clyde ahead of final assembly in Glasgow.