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The nearest support groups to Muswell Hill are at Stonecroft Children's centre, 100 Priory Road (just below Ally Pally) on Wednesdays 10-12 (you have to phone to book a slot for this one).
Or Highgate Family Centre, Gaskell Rd (on the grounds of the Highgate Primary school off North Hill). They have a lactation consultant/ breastfeeding counsellor available during the weigh-in clinic on Tuesday morning 9.30-11.30 and a support group on Thursdays 12.30-2.30 run by a lactation consultant and Breastfeeding Network helpers.