good advice and it certainly worked for me recently - I phoned the prospect and said "Hi ..... I 've been shooting for X,Y and Z along your borders, and it seemed to make sense to me to see if I can control pests on your land too. Joined up thinking. Would you have any objection to me controlling pests on your land too?" or words to that effect.
Landed me 650 acres of mixed land, the best I have to date.