Offering Free Leeds to Builders in London

Calling a list of builders in London.
Get name of primary contact and contact email address for future emailing.
Tell them that we are launching a new lead generating service where the builder decides how much they will pay for leads. We need a number of builders that are willing to take two or three leads for free (and provide feedback on how thing work and how we can improve service)
If they say yes, then take details of services they provide and postcodes they are willing to cover.