Same bush will be good for next year and the problem is Gooseberry Sawfly. Just Google the above for many organic and inorganic treatments.

your bush will be fine next year unless it is attacked again. follow the advice re Gooseberry sawfly
https://www.rhs.org.uk/advice/profile?PID=517

The wild gooseberry bushes along our lane are defoliated like that every year and always produce fruit without any human intervention.

I put in a gooseberry 'Captivator' this year having failed with a previous try so I'd be interested in how you get on?
Mine hasn't done brilliantly either this year, some reddish discolouration & damage of the leaves which I put down to a new plant in a ridiculously hot Summer.
I may need to do a bit more research on the ideal position re: shade & soil type so if I find anything informative I'll add them

I had sawfly this year too - first time for ages. I was told recently that the little darlings overwinter as grubs in the soil under the bushes so might try putting some black plastic round the bush next summer so they can't get out - might work!
Keep a sharp look out too for the newly hatched caterpillars - catch them at the right time and there will be a ot of tinies alltogether and you can just take off the leaves they are on.

Darren try putting sulphate of potash round your bush in February when you do the pruning.

My two oldest gooseberry bushes got defoliated every year and it never seemed to inhibit their crop the following year.

Potash & moderate pruning, got it. Thanks!

My daughter had exactly the same problem about a month ago. More leaves and tiny gooseberries have appeared since - only to disappear again thanks to the sawfly.