Chief Rabbi Sir Jonathan Sacks. He is the religious leader of the Jewish community in the UK. Rabbi is a Jewish word meaning Teacher.
A Chief Rabbi
As of 2011, the most famous Sephardi rabbi in Israel is former Sephardi Chief Rabbi of Israel, Rabbi Ovadia Yosef.
Their last Chief Rabbi was Rabbi Chalom Messas (1961-1978).
The Chief Rabbi is in charge of the Jewish community in the country he lives in.
Rabbi Riccardo Di Segni
Sir Jonathan Sacks is the chief rabbi
No. In fact, most countries in the world do not have chief rabbis. But if the synagogue has more than 1 rabbi, the Senior Rabbi should be present if possible.
Judaism is not a centralized religion with a "head Rabbi" or any single leader. Some countries have chief rabbis, but they are more like advisors for their specific communities. The United States does not have a chief rabbi.
There are synagogues, kosher restaurants and markets, mikvaot and schools in London, Leeds, Manchester, among others. Most likely, neither the Christian nor Muslim communities are supporting these. Moreover, there is a Chief Rabbi of the UK.
You may address then as Rabbi, or just use their name; both are acceptable.
Rabbi Myers's birth name is Isadore Myers.
There is no special word for the home of a Rabbi.