What a great crop of gooseberries.
Growing as a standard, or espalier as I do, means the bonus of far fewer pricked fingers and scratched hands at harvest time than bush trained ones as I'm sure you will testify.
You also obviously have the pruning right as the other thing to note is that from the photograph the fruit is clearly being borne on short spurs on the older branches. This years new growth is growing upward above the ripening fruit from the photograph's perspective.
Pruning all the current years growth down to a couple of buds every winter will not only keep the standard's shape, reduce pruning in subsequent years, and also produce bumper crops like yours every year. (but of course you already know that.
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Thanks for sharing you super achievement with us.