The Royal Navy has been reduced to just :-
4 assault ships - 2 not available plus one of the 2 now in service to be decommissioned this year
19 surface warships ( 6 destroyers and 13 frigates )
4 ballistic subs
7 fleet subs
15 mine countermeasure ships
and numerous small craft.
Many of those will be undergoing re-fit and maintenance at any one time.
75 years ago the fleet consisted of 15 battleships and battle-cruisers with 5 under construction, 7 aircraft carriers, 66 cruisers with 23 more under construction, 184 destroyers with 52 under construction, 45 escort and patrol vessels with 9 under construction and 1 on order, and 60 submarines with 9 under construction.
The UK Home Fleet now comprises a single surface warship and it will require 30% of our surface warships to protect one of our new carriers when they eventually come into service.