Cumbria Waste Management Limited
Cumbria Waste Management Ltd, along with Cumbria Waste Recycling Ltd, Lakeland Waste Management Ltd and Lakeland Minerals (see https://www.cumbriawaste.co.uk/) make up the Cumbria Waste Group. It's subject to FOI, unlike others which are only covered by EIR, due to its public ownership - it's ultimately owned by Cumbria County Council (see second paragraph as of now on https://www.cumbriawaste.co.uk/about-us/). Cumbria Waste Management Ltd's significant control is held by Cumbria County Holdings Limited:
https://beta.companieshouse.gov.uk/company/02665973/persons-with-significant-control

Notes in a FOI request from 2017 confirm the County Council
as the top level owner -
https://cumbria.gov.uk/elibrary/Content/Internet/536/6357/42907102155.PDF

This is supported by CCH's accounts, which state: "The company is
a 100% owned subsidiary undertaking of Cumbria County Council. The
accounts for the parent undertaking are available from The Courts,
Carlisle, Cumbria, CA3 8NA".