For firms that cross jurisdictional boundaries, especially those that cross the Atlantic, lawyer remuneration and, in particular, parity of pay can be a political hot potato.

We have seen many UK and US firms get married in recent years and most of the merger announcements have used the same flowery language to describe the deals: service to clients, multinational experience, cross-office synergy, common culture and the like. But law firm mergers, like some marriages, most often rise or fall on money, not love.