I believe Spearfish is also much slower at greater depths due to the back-pressure on the turbine. To make use of the high speed they run it out at a shallow depth, and dive down on to the target (if it is a submerged submarine).
This aiui is not really necessary, it doesn't start to slow down until it gets really deep, talking significantly >500 meters
 
Looks like this might be in exchange for a pair of extra submarines. So, we've got a whole 'submarines vs anti-submarine frigate' dilemma.
 

This is not a particularly newsworthy item to those familiar with the programme, but hopefully this section will put to bed the rumours that the RN might be forced to cut Type 26 orders to supply Norway (in order to save money overall).

Pollard added that the Royal Navy’s programme would not be reduced, stating: “The Royal Navy will receive all eight Type 26 ships during the late 2020s and 2030s as planned.”
 

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