I've received an e-mail from Sharon at the "Forward" programme to confirm that it's now closed and there's no other promotion in its place. So, my dream of first class upgrades and free cups of tea is no more.
But, in better news, she's confirmed that season ticket holders can indeed reserve seats for no cost, despite the website suggesting that a £5 fee could be charged for each reservation. So, I've given her a list of dates, and wait to see whether the system works. The first reservation I've asked for is tomorrow, so fingers crossed I could have a guaranteed seat for my bum at the end of the day. I'll let you know.
To answer the question I posed in the title, I've used a picture of a duck because I'm getting a bit stuck for pictures that don't involve a FGW train, in order to illustrate the seat reservation issue. So, instead I've decided to throw caution to the wind entirely, and take full advantage of the lovely images provided by Free Foto. I hope you like it.