Kirkpatrick & Lockhart Preston Gates Ellis' London office has completed one of its biggest-ever deals – advising on a A430m (£299m) pan-European petrochemicals transaction.

The firm advised Spanish chemicals company La Seda de Barcelona on its acquisition of the European business of Australian packaging company Amcor, which includes groups in the UK, Belgium, France, Germany and Spain.

Corporate partner Jeremy Davis led the team, which also included partners Richard Talbot and Neil Baylis, advising on financing and competition respectively.

The deal also marked the first transaction on which the London team has worked with partners in the firm's Berlin office, which was launched at the beginning of the year with the hire of a group of lawyers from Taylor Wessing.

It is Kirkpatrick's second deal for La Seda and follows its role advising the company on its A320m (£222m) acquisition of three production plants from polyester manufacturer Advansa last year.

The Amcor acquisition is the fourth significant corporate instruction for Kirkpatrick this year. Davis was also involved in advising the vendors – including Balfour Beatty – on the £350m disposal of dockyard operator Devonport to Babcock, advising Bestinvest founder and majority shareholder John Spiers on the sale of the company to 3i over the summer and advising Halliburton on its acquisition of PSL Energy.

The London team was part of legacy firm Nicholson Graham & Jones, which merged with US law firm Kirkpatrick & Lockhart at the beginning of 2005.

Davis told Legal Week: "In some ways this size of deal is becoming typical of the deals we have been acting on since the merger with Kirkpatrick. We are stronger and building a better name."

Amcor turned to Canadian law firm Davies Ward Phillips & Vineberg, where Montreal corporate partners Peter Mendell and Rita Lc de Santis advised.

The transaction, which was conducted under English law, saw Freshfields Bruckhaus Deringer and DLA Piper providing UK advice to Amcor.

The transaction, which started with an auction process in the summer, completed on 22 October following merger clearance.

La Seda makes plastic chemicals products including detergents, polyester, explosives, cosmetics and polyurethane foam. It also manufactures textile products.