Premium Listing
From ACT Wiki
London Stock Exchange
A Premium Listing on the London Stock Exchange is only available to equity shares issued by trading companies and closed and open-ended investment entities.
Issuers with a Premium Listing are required to meet the UK’s super-equivalent rules, which are higher than the EU minimum requirements for a Standard Listing.
A Premium Listing means the company is expected to meet the UK’s highest standards of regulation and corporate governance – and as a consequence may enjoy a lower cost of capital through greater transparency and through building investor confidence.