How about option 5?
As you had one member of the group who's something of an expert on trains and ticketing, the group could have joined the part of the train in which the train manager was travelling. A quick "can you sell us a Groupsave" as you joined, "yes of course", and Robert's your parent's brother.
For a group of newcomers to GWR▸ , just getting in at any 'random' door's reasonable. For a group that includes a fare, terms and conditions expert, joining the train at the opposite end to the conductor on a none-corridor pair of units could be questioned as to whether it was a deliberate act to maximise the chance of not having to pay. I appreciate a decision in the heat of the moment (you probably didn't know what train type was going to turn up) but in hindsight it leaves muddy waters.
I did know what type of unit was going to turn up. The down service, that was to return up from Paignton, passed us while we were walking the sea wall.
I explained to the family how the scenario would likely pan out after my cousin (regular GWR west user) said we could get a free ride. That there may not be an opportunity to purchase if we were to board the front unit. I was out-voted for suggesting we approach the Guard. However, there was every chance there would have been an Assistant Ticket Examiner in the front unit.
I say 'every chance'. This was a Saturday and we all know what GWR's staffing is like at the weekend!
Also, I noticed the Guard wasn't kitted up on arrival at Dawlish or Dawlish Warren.
I do like a bargain, and as you probably know, I do like to use all the legimate dodges and wheezes to pay as little as legally possible for my train journeys. I also like to ensure, as far as practicable, journeys are recorded by the operator for passenger number figures. I explained to the family the worse case scenario should we encounter an
RPI▸ . Group consensus was go for the potential 'free ride'.
<pedant> Option 2 - surely you would not buy 9 tickets at £2.40 and claim a third back. Wouldn't you buy 8 at £2.40, one for the child at £1.20 and then claim £1.20 less than a third back?</pedant>
I would. You are allowed to by an adult ticket for a child to take advantage of GroupSave.
We are happy with the decision taken, and I'm still prepared to contact GWR, offering to pay. I wasn't wanting opprobrium for our choice. Just asking, "What would you do?"
All said, we had a lovely afternoon. Here's the bignosemac clan enjoying the walk: