Hopefully the Bedford Databank will never be "finished" as we hope that new additions will come into the public arena for many years to come, but to answer your question.
Everyone will be able to contact the owners, but not direct as the owners contact information will not be made public .
Contact will be able to be made via the website, you identify who you want to contact and send them a message via an on-line form which they will recieve at thei email address or in the case of those who have not quoted an email address, it will be sent on by regular mail.
I hope this helps
David Griffiths