Downsized, correct, that is the 100% model with, in your case, 75% at various readiness states giving a total force % readiness of 25% albeit it is capable of reaching 75% fairly quickly.
The continuous replenishment model runs at about 70% and is also capable of being ramped up.
Which model is more combat effective? Which is more economical in costs and manpower?
Possibly your Herrick cycle, putting full trained units into the field is better for that operation and the UK base, continuous replenishment model, is better for a long term cold war readiness requirement.