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The article says:
Six fire engines and around 40 firefighters attended the blaze above Cycle Stop on West Green Road at around 7pm on Sunday evening.
My emphasis. I merely speculated about a flat above the shop, but it's obviously likely that that's what the floor above is used for. Equally obviously, it's possible the 'above' is incorrect and that it did start in the shop, but the article doesn't say that.
Indeed, a battery fire. This report suggests that it started with a battery fire above the shop, but later affected batteries stored in the shop.
https://www.standard.co.uk/news/london/cycle-shop-tottenham-ebike-battery-fire-b1169695.html
Obviously no suggestion the shop did anything unsafe. Above was probably a private flat. Terible luck. I hope they're insured and manage to get back on their feet.