Exceptional circumstances require exceptional measures unfortunately and, as usual the only loser is the innocent customer.
When a flow of regular customers switches from the bus operators own tickets to PlusBus in a matter of weeks it arouses suspicions, when one of them, questioned by a driver (out of curiosity !) tells him they buy them from the local station because they are cheaper than the bus company's own tickets (a weekly being about 40% cheaper) it is a cause for concern. That was when we investigated how easy it was to buy a PlusBus without a rail ticket and it was as simple as: "I'd like a X PlusBus please" with the response "That will be £3.00 please", there was no mention of a train ticket.
The problem, as I've tried to point out on here, is that there is no way, certainly for bus operators, to police this. Whilst numerous people on here keep referring to us 'breaking' the terms & conditions not one person has commented on the basic problem of the TOCs booking office staff breaking the primary condition of not selling a PlusBus without a valid rail ticket. If that was adhered to then the problem would not exist. A simple change to the ticket format would also help, something like 'sold with ticket No. XXXXXXX' printed at the time of purchase would prove the holder had rail ticket at that time.
Since we took this action the number of local PlusBus tickets seen has reduced & our own ticket sales have increased, without any complaints I might add.
I also note that another post refers to buying PlusBus without a rail ticket so the problem is not unique to us.
Sussexman points out that he does not need to show his railcard when buying online (!) I just hope does if 'buying over the counter' as that is enshrined in all of the Railcard Terms & conditions, or is that another case of Booking office staff ignoring the rules.
Case closed