Armor supply, escort building, and carrier delays

Did lost Czech armor supplies or the construction of frigates and corvettes cause Britain's slow carrier program?

No. Britain could supply its own armor, much escort construction came later, and additional carriers could have protected convoys while escort carriers were still unavailable.

The first proposed bottleneck is the loss of Czech armor plate after German expansion. British suppliers could provide the necessary plate, so that shortage does not explain the construction pause. A second comment points to frigates and corvettes, but many of those programs matured after the carriers should already have been completed. More carriers would also have supported major convoys and helped bridge the mid-Atlantic air gap before escort carriers became available. The exchange turns the presumed industrial tradeoff around: delaying carriers could worsen the shipping problem the escort program was meant to solve.