Welcome to OpenStreetMap.

For places with London postcodes, the value of addr:city is London, corresponding to the post town.

The optional name of the suburb, in this case Neasden goes into addr:suburb

Phone numbers should be in international format, e.g. +44 20 xxxx xxxx

I've tweaked the tags for this branch in https://www.openstreetmap.org/changeset/162464809