Well, it didn't go exactly to plan. The ticket clerk said I would have to get two single tickets with the different routings, and refused to entertain my request for the return*+ excess, even cutting me off with a testy "I know what I'm doing". I even asked a roaming queuebuster guy with an Avantix afterwards whether he thought the ticket was right but he said I needed to go back to the travel centre and get a supervisor, which would have caused me to miss my train. (Can't really blame him on this; standard practice in service industry should be not to contradict a co-worker unless you have spoken to them first and got their side of the story.)
So the net result is
- a route Ascot SVR from BZ3 to Reading Stations which means I got charged 30p more than [what I think is] the right fare
- a likely uphill battle at Reading tomorrow to get a £0.00 excess to route Slough, or I may just jump on the FGW and do it on board in the unlikely event I find a guard
- an annoyed letter going off to SWT early next week. I have the names of all the staff concerned, and they were all wearing SWT uniform and name-badges.
This isn't about the 30p difference, before anyone pipes up; it's about impartial (and competent) selling, with a side order of manners.
And to top it off, my ticket was rejected at Reading with seek assistance code 107, whatever that may be.
Round 2 is tomorrow when Mrs. island tries the original LONDON NOT UND.
I feel a bit better now for writing that; Mrs. island is entirely unsympathetic with me about esoteric train tickets!
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FGW ticket clerk at RDG was happy to issue me a £0.00 excess to route SLOUGH on my ticket. And Mrs. Island had her ticket passed without incident by the gate at PAD. Will advise later if she has any problems at CHX (she's gone off shopping

)
Has anyone the name of a customer service manager in SWT or a good address to write to? (I assume it's SWT even through WAT is operated by NR, as it was all SWT staff I dealt with yesterday.) Otherwise I'll just send it to the address on their website.
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Mrs. Island's ticket worked in the gates at CHX too.