A friend asked if I knew of a shotgun marked Lepco which sold at one time for 225 pounds. I've asked for more information. Anyone like to take a shot?

Just a wild guess based on a fragment of information: Maybe Le Personne & Co? Described in Boothroyd's "Directory" as "agents", London address, circa 1900.

Not bad for a wild guess !.
From the Internet Gun Club :-
Established in 1894 at 24 Great Winchester Street, the firm moved in 1895 to 99 Cannon Street.
From 1903 to 1980 the firm were distributors for Browning in the UK.

In 1934 they moved to 7-8 Old Bailey, and in 1936 became a limited liability company.

In 1972 they moved to Century House, Noble Road, Eley Street, Edmonton, and in 1981 to Lawrence House, 5-8 Riverfront, Enfield.

The firm appear to have ceased acting as agents for firearms in 1982.

The firm is known to have sold "Lepco" and "F N" cartridges in the UK. "Lepco" was their own brand name, but whether they loaded them themselves or not is not known.

Nigel Brown also lists them.

Thanks, all. My friend thinks I know all about guns. You've lifted my cred. I emailed your replies to him.