As the original thread has been closed I thought I would let you all know what happened !!!
I boarded the 1852 Edinburgh to Birmingham Virgin Service - it was from platform 11 so no pre-boarding ticket check.
So much for the theory it was "a quiet service" it was rammed however got a seat ok (no seat reservation with £1 special)
My printout of my reservation (ticket) was checked just outside Edinburgh by the TM interestingly all she did was stamp the paper, no apparent check was made of the reservation on her ticket machine.
The crew changed at Preston and as advised I was going to ask the new TM if it would be ok to get off at Wolverhampton and catch my Sandwell & Dudley train for which I already had a ticket.
Suprise - there was no further Ticket Check and the TM didn't materialise.
It was with some trepidation that I alighted the service at Wolverhampton half expecting a "welcoming committee" of RPI'S and / or BTP.
However boringly my fears were unfounded I crossed from Platform 4 to Platform 3 and boarded the waiting 2245 service to London Euston which of course stops at Sandwell & Dudley.
No ticket check was carried out on this short hop or at Sandwell & Dudley.
So the "Eagle had Landed" without having to check the legality of "John at Homes" excellent thesis on the subject.