Possible Clues:

• Line manager who'll need more than one line?
• Fisherman's position by river
• One tries to catch old Englishman with Queen
• Be irritating about length -- he tends to exaggerate it
• One hoping to find a school
• Uses 24 down and is fond of the cast
• Eg Walton's fury about Sitwell, ultimately
• One after gudgeon left in dudgeon?
• One patiently sitting at the riverside left in rage
• Strait; — of Lochalsh