Ask an Property Solicitor. Get an Answer ASAP.
I took your advice and have received today the following response...
We cannot send a copy of the contract out to the tenants as it would be incomplete, the tenants will have an opportunity to read through the contract before any signing is done, please can you let us know a date that the tenants will be attending the office.
I have replied saying that I did not say any reason why the contract should be incomplete as surely it would only be missing signatures? And also that a read through just prior to signing was not really acceptable.