Diana Jackson

Her merger work has involved unilateral, coordinated, vertical and conglomerate effects, and has covered a broad range of industrial sectors. She has worked for the merging parties on a large number of mergers before the UK competition authorities, including St Gobain/Kilwaughter Minerals, Penguin Random House/Simon & Schuster, Jacobs/Wood Nuclear, Sainsbury’s/Asda, Celesio/Sainsbury’s Pharmacies, AAH Pharmaceuticals/Masta and Sangers, Whittan/Lion, Whittan/Apex, ATOS Medical/Countrywide, Jewson/Build Center, Travis Perkins/BSS, Rough Undertakings Review, Centrica/Lake Acquisitions, Home Retail Group/Focus stores, Pan Fish/Marine Harvest, and Centrica/Rough.

She has also advised on many European merger investigations, including CVC (Cooper)/Viatris OTC business, INEOS/TotalEnergies ethylene assets, CVC (HHG)/Ethniki, Siemens/Varian (on behalf of a third party), CVC (Recordati)/Cooper, INEOS/BP Chemicals Business, Suzano/Fibria, Andromeda/Nireus/Selonda, Rexam/Ball, ICIG/INEOS Chlorvinyls, INEOS/SolVin, Baxter/Gambro, UPS/TNT, INEOS/BASF Styrolution JV, Unilever/Sara Lee Personal Care, Posten/Post Danmark, INEOS/Kerling, KarstadtQuelle/MyTravel, Andersen/Ernst & Young, GE/Honeywell, and Airtours/First Choice – including on the European Court Appeals of UPS/TNT, GE/Honeywell and Airtours/First Choice.

Diana has advised on numerous market investigations, including the CMA’s investigations into veterinary services on behalf of CVS, groceries, loyalty programmes and road fuel pricing on behalf of Sainsbury’s, funerals on behalf of Memoria, energy on behalf of Centrica; as well as the FCA’s investigation into asset management on behalf of Schroders; and Ofgem’s implementation of a domestic energy price cap on behalf of SSE.

She has also provided advice in relation to several anti-competitive practices cases.  This includes several cases on excessive pricing in pharmaceuticals – including acting as an expert witness and giving written and oral evidence at the CAT; as well as on rebate structures in postal services; and issues relating to gas flexibility, automotive spare parts and capsule compatibility for espresso machines.  She has also conducted studies of the damages resulting from cartels in sectors including high voltage underground cables, air freight, gas insulated switchgear, wire harnesses and synthetic rubber.

Diana has acted as an economic expert in proceedings before the UK High Court and Competition Appeal Tribunal and appeared as an expert witness before the UK Competition Appeals Tribunal, South African Competition Tribunal and the Swedish Market Court.