China manufacturer at the Gladstone Pottery, Longton, Stoke-on-Trent, England.

• George Procter had been a partner in the earlier companies of Hodson & Co and then Procter, Mayer & Woolley. 

• George was in business with his brother Albert Hodson Procter and they were joined by Bernard Kellett Procter (probably the son of one of the brothers). 

• George Procter died in 1910. The December 1910 Pottery Gazette records.... "I regret to record the death of Mr. George Procter, china manufacturer, High-street, Longton. Mr. Procter, who was 73 years of age, and had been unwell for a considerable time, died at his residence on November 20. The funeral took place at the Longton Cemetery on November 23, in presence of a large number of relatives and friends."

• The company continued and retained the name 'George Procter & Co'  

• In 1939 the business was acquired by Thomas Poole (Longton) Ltd and was renamed Gladstone China (Longton) Ltd.  

Gladstone China
G P & Co
L
Made in England 

typical mark of George Procter & Co
the 'L' stands for LONGTON - the
town where the factory was based

Imari ware - on Wikipedia

early style mark
possibly pre 1924 

1924-39

Gladstone China
G P & Co
L
Made in England 

items in the set shown bear these two variations of the 
George Procter mark

Gladstone China
G P & Co
L
Made in England