Report calls for Wales' 22 councils to merge

A key report will call for Welsh councils to be reorganised through mergers, BBC Wales understands.

On Monday the Williams Commission is expected to suggest existing local council boundaries as the "building blocks", not new lines on the map.

New councils should also be within current health board and police force areas, the report is understood to say.

The commission is expected to call for a cut in the number of councils in a wide-ranging review of public services.

BBC Wales political editor Nick Servini reports.