You can try undoing the nut the red arrow points to without shutting the water off and squeezing some PTFE round the stem(?) before doing it back up. Search "leaking stop tap" or similar on YouTube for examples.
Search "leaking stop tap"
Cheers for this! After how ever many years I've fixed my leaking outdoor tap.
@hugo7 started
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You can try undoing the nut the red arrow points to without shutting the water off and squeezing some PTFE round the stem(?) before doing it back up. Search "leaking stop tap" or similar on YouTube for examples.