I would strongly suggest that you approach a member of the APDT
http://www.apdt.co.uk/or the APBC
http://www.apbc.org.uk/ (you need referral via the vet for the latter) instead of using Barkbusters
http://www.barkbusters.co.uk/.
Quote: "Previous experience with dogs is not the criteria by which we select therapists"
Barkbusters is a franchise operation whose members do not necessarily have to have had any experience with dogs let alone professional training or accreditation.
The advice you have been given is, to be quite frank and polite, totally erroneous; what you will end up with is TWO barking dogs.
Please seek advice from reputable, registered trainers or behaviourists.
If you feel you would like further help from experienced Weimaraner owners why not contact
http://www.weimaraner-forum.org.uk/