Valentina Sloane KC > Chambers of Tim Ward KC and Philip Moser KC > London, England > Lawyer Profile

Chambers of Tim Ward KC and Philip Moser KC
Monckton Chambers
Valentina Sloane photo


Valentina is a leading barrister in EU relations, procurement and tax law, including VAT, excise and customs duties.

The directories have consistently recommended Valentina as an outstanding practitioner.

Valentina has extensive experience of leading heavyweight, complex and high-profile litigation. Her recent cases include appearing before the Grand Chamber of the Court of Justice of the EU in a challenge to the validity of EU tax legislation and representing the claimant in a challenge to the Government’s procurement of a £1 billion contract for a supercomputer, one of The Lawyer’s Top 20 cases of 2022.

Valentina was previously a member of the Attorney General’s A Panel and has wide-ranging public law and judicial review expertise.


Qualified 2000, Gray’s Inn.




Oxford (BA Law, First); Brussels (Diplôme d’Etudes Spécialisées en droit européen, grande distinction).

Lawyer Rankings

London Bar > Public procurement

(Leading Silks)Ranked: Tier 1

Valentina Sloane KCMonckton Chambers ‘Valentina is excellent at complex litigation work.’

London Bar > Tax: VAT and excise

(Leading Silks)Ranked: Tier 3

Valentina Sloane KCMonckton Chambers ‘Valentina is becoming the go-to silk for customs and VAT disputes. With a tireless work ethic and effortless advocacy style, she is a delight to work with.’

Monckton Chambers boasts ‘a number of excellent barristers at a senior and junior level’, offering an unrivalled breadth of experience in indirect tax matters; combining VAT expertise with extensive knowledge of EU, human rights and public law. Melanie Hall KC regularly utilises her wealth of knowledge across the tax realm to litigate on emerging and nuanced areas such as cryptocurrency. Valentina Sloane KC is acting for the Swedish drinks maker in Kopparberg and Cider of Sweden v HMRC, a High Court claim against the UK for an alleged breach of EU law concerning post-duty point dilution which could result in subsequent claims worth hundreds of millions. In Devon Waste Management Ltd & Others v HMRC, Hall KC and Brendan McGurk successfully represented HMRC in the significant test-case challenge brought by leading landfill operators who sought repayment of £3bn of allegedly overpaid landfill tax. Peter Mantle represented the appellant in The Royal Opera House Covent Garden Foundation v HMRC, seeing the Upper Tribunal declare that the sale of goods such as ice cream sold during intervals are not includable when recovering VAT input tax associated with production costs.