Over the 'Open House' weekend, I visited the oldest Ashkenazi synagogue in London - and I believe the only one still open in Spitalfields.
It's on Sandys Row off Middlesex Street, in an eighteenth century building originally a Huguenot church (though from the exterior looks not in the least clerical).
A Dutch Jewish congregation established a synagogue here in the 1850s, and it still thrives. I suspect that very few of the congregation are local, but they obviously tend the building with loving care.
And judging by the throng looking round the synagogue today, I'd say about equal numbers Jewish and gentile, there's a huge amount of interest and affection for the building and the community history it represents.
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