Joseph:
There are a mixture of state aided and independent schools serving the heimeshe community. All are fee-paying, and it is a significant expense.
And London, as a cosmopolitan City, is more international than local, with a few local accents, the most easily recognizable of which are Cockney and RP, and a varied and curious mixture of foreign accents and languages, of which the most common include Portuguese, French, Polish and Arabic. These vary across London.
Generally worldwide, most countries have a wide range of accents, including in the US. The UK simply has the greatest variety, perhaps due to its reasonably stable and longstanding indigenous population, which leads to specific areas having distinct and established identities, cultures and, naturally, accents. There are also a variety of local languages, including Celt, Welsh, Cornish and Gaelic (In parts of NI).