Not strictly Stroud Green, but near enough nevertheless, due to the bridge replacement works, Holloway Road is closed in both directions where it meets Highbury Corner until 8th January. There will also be period of no Overground trains during the festive period, linked to the works: http://www.islingtongazette.co.uk/news/highbury-corner-is-now-closed-for-three-weeks-1-5324443
In a previous discussion on this topic some people were finding it hard to visualise what the 'bridge' was that was being replaced at Highbury Corner. It's certainly harder to picture than at Crouch Hill.
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So you might be better parking round the park by the swimming pool and walking round.
These photos help, and frankly it's mindblowing:
https://consultations.tfl.gov.uk/roads/highbury-corner-roundabout/