The oldest of all might be Rinkoff Bakery, which predates the rest by decades. Though not a restaurant, it is a clear benchmark in Ukraine’s impact on London. Founded more than a century ago by a Jewish family in Whitechapel, it specialises in speciality breads, cakes and challah, and today might be best-known for its crodoughs, a popular croissant-doughnut hybrid popularised about the same time that Instagram really took off.