At present the UK operates 6 SSN's this allows 2 on station at all times and 4 SSBN's which allows one on station at any one time, however once all the Astutes are built the total will be 7 SSN's.
Right now the UK budget does not support or could not support rather the addition of SSK's to the fleet, this is due in part to lack of budget as the current aircraft carriers will drain a lot of funds, as will the up coming type 26 and 31 FFG's.
With that in mind we also have a lack of crew for more submarines, something Australia is about to find out in the coming years the hard way.
The current UK doctrine does not have the requirement for SSK's either AIP or Conventional, this is due in part because of their operations, which like the USN is over seas.
We do not need SSK's in out fleet even for a coastal role or forwardly deployed there's just no call for them anymore.
With Perisher we work very closely with the Dutch navy and we train prospective captains using the dutch boats as well as our own.
Because we are so interlinked with European navies and NATO we do not require to have our own.
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