"The UK Ministry of Defence is considering options for a follow-on Submarine Launched Underwater Weapon (SLUW) to succeed the current Spearfish heavyweight torpedo in Royal Navy (RN) service from the middle of the next decade.

BAE Systems handed over the last Spearfish on the 24th of November from a Main Production Order (MPO) and combined In-Service Support contract placed in December 1994. Spearfish was originally developed to counter the Cold War threat posed by fast, deep-diving Soviet nuclear attack submarines with the first deliveries to the RN starting in 1988."