The business was successful, with major variety theatres in almost every city in the UK and Ireland, and was advertised as the largest group in the world.
The first Royal Command Variety Performance was planned for Sir Edward Moss's Edinburgh Empire in the Coronation year 1911 but it burned down and instead was held at the London Palace Theatre in 1912, owned then by Sir Alfred Butt, a competitor of Moss, who later joined its alliance; with many subsequent performances being given at the London Palladium.
In 1932, impresario and producer George Black oversaw the merging of GTC (General Theatre Corporation) with Moss Empires variety circuit.
Black became in charge of the new company Moss Empires Group and controlled a chain of 53 theatres all over the UK.
In 1938, Black became the joint managing director of Moss Empires making him one of London's most powerful producers before his death in 1945.