How do you stop them picking up there own work and not paying 20% to you ?
This is some thing i have been wondering for a while.
That's where the contract comes in. Doing 'foreigners' is specifically banned in the contract, along with hundreds of other things, many of which I'd never thought of till I went to a Franchise Solicitor. Apart from the fact that you can cancel their contract, their vans all have the company signwriting and company telephone numbers on them and they have to wear their company uniform while working. It only takes one call: "you're man xxxxx did my windows today and ......." I have caught the odd one trying to slip a sly one in - all it takes is a gentle reminder that it could cost him his entire business.
On the subject of contracts: The reason I paid for a proper contract instead of relying on the one I wrote myself is that should I have to take a franchisee to court, a judge would scrutinise my entire contract and if he deemed any part of it to be unfair or unenforceable, the whole contract would be declared invalid.