£650k and £1760, band D. London, not central.
If you live in a densely populated area, with lots of properties and businesses and/or many properties are in higher council tax bands, the councils are able to charge less to reach the per population funding required.
Unfortunately the reverse of that is if you live in an area with fewer properties/businesses and/or most the properties are in lower bands, then the individual bills must be higher to generate the same income per head.
Hence why the council tax rates are relatively low in many London boroughs when compared to rural constituencies.