I saw someone online saying that after the end of the Cold War, British shipyards lost their shipborne weapon systems and had to turn to shipborne weapon suppliers from other countries.What do you think
It's wrong in every detail.
At the end of the Cold War foreign weapon systems on UK warships were Exocet - French, Harpoon/Sub Harpoon - US, Bofors 40mm/70 - Swedish and (just squeaking in) Goalkeeper - Dutch and Phalanx - American .
Whereas British systems were Sea Dart, Sea Wolf, 114mm Mk 8, 30mm DS30M Mk I, 20mm Oerlikon** (Swiss by design, but British by manufacture), 20mm GAM-B01(Swiss 20mm KAA on British mounting) plus the L7 GPMG (Belgian design, British manufacture) and Stingray. Turning to subs, Tigerfish and Spearfish. And if you count helicopters, Sea Skua. Plus the Outfit DEC laser dazzler.
And Polaris/Chevaline, with a British re-entry vehicle on a US ICBM booster.
So 5 foreign/12 UK. (Plus Polaris/Chevaline)
Current foreign systems are NSM - Norway, Tomahawk - US, 127mm Mk 45 (US, but British owned), 57mm Mk 110 (US variant of a Swedish design, but British owned), 40mm Mk 4 (Swedish, but UK owned), and Phalanx.
Current British systems are Sea Viper, Sea Ceptor, 114mm Mk 8, 30mm ASCG, 30mm Seahawk (US Mk 44 on British mounting*), 20mm GAM-B01(Swiss 20mm KAA on British mounting), .50 L111 (US design, UK manufacture), plus the L7 GPMG (Belgian design, British manufacture) and Stingray. Turning to subs, Spearfish. And if you count helicopters, Sea Venom and Martlet. Plus Dragonfire.
And Trident II/Holbrook, with UK warheads inside a reworked US re-entry vehicle.
So 6 foreign (3 of which British owned)/13 UK.
In other words very little change, apart from BAE Systems swallowing up a lot of foreign suppliers.
* MSI are also supplying the USN with the 30mm Mk 38 Mod 4 nowadays.
** Not quite sure when we replaced the last of the WW2 era 20x70mm guns with the KAA based GAM-B01s.
*** The 7.62mm miniguns have been replaced by the .50s.