If you're going to be taking several train journeys per year in the UK, and especially if you won't be starting your journey until 10am, it's well worth investigating the railcards available, as for certain classes of journeys then can yield a large saving. (They're especially good for families, students, people travelling in the south-east of England, and the over 60s)
I've been making good use of my railcard this year, and it's due for renewal fairly soon. I know I'll want to use it on the day after it expires, but there are normally long queues at the ticket office at that time, so renewing it then will mean having to get to the station much earlier that usual.
What I'm wondering is if I could go to the station at a quiet time before the railcard expires, renew it, and have the remaining time from the old railcard added to the validity of the new one?