Complete the construction of the Astute class of hunter-killer submarines.: Pending
The Astute class is the newest group of fleet submarines in service with the Royal Navy that are nuclear-powered. There will be 7 boats in total, the first one was commissioned in 2010 and the last is expected to be commisioned in 2024.

Thus far 4 submarines have been completed and handed over to the Royal Navy. Production has begun on all 7 of the vessels.

Category: Security and Crime
Source: Manifesto - Page 41
Reference 1: Gov.UK Update