Is there any competition for warship design in the US and the UK? .. how about nuclear subs?
US FFG(X) had a total of six entrants. Lockheed Martin with a Freedom class derivative, Austal USA with an Independence class derivative, Huntington Ingalls had a Legend class cutter turned frigate, then the FREMM, the Navantia F100 variant backed by General Dynamics, and then a dark horse from Thyssen Krupp that offered a MEKO derivative. LCS had three entrants, Lockheed Martin, General Dynamics and Raytheon. The contract was given for two leaving one out.
UK Type 31 had three entrants, one from BAE, one from Thyssen Krupp with a MEKO derivative, then from Arrowhead with an Iver Huitfeldt derivative.
The reasons why the Type numbers skip for the UK, like Type 22 and 23 ---> then to Type 26 --- then to Type 31 --- is that these numbers in between, like Type 24, 25, 27, 28, 29, 30, are competing proposals that were eventually not accepted.