To quote your numbers from that thread
Type 23s:
13 ships. Of which:
4 active
3 in refit
2 in maintenance
3 in post refit work up
1 laid up
Type 45s
6 ships. Of which:
2 active
1 refit
1 maintenance
2 laid up!
So that's 19 vessels 6 of which are active - we seem to spend a lot of time in refit and training TBH - and 2 of our main surface fleet laid up .........................
On that basis we'll only have ONE Carrier available for 70% of the time and no carrier for 30%