Commonwealth fleet balance around frigates

In a UK/Commonwealth superpower scenario, would every member adopt the biggest and most expensive military kit?

No. Most members would operate frigates rather than carriers, cruisers, or destroyers, with the balance between top-line and second-line ships depending on their finances.

A Commonwealth superpower would still contain forces with different budgets. Frigates would probably be the main choice for many members, and not everyone would operate carriers, cruisers, or destroyers. One option would be a small force made entirely of first-line frigates. Another would combine more second-line frigates with a few first-line ships. Finances would determine which balance each member could afford.