Train fares seem to be a law unto themselves, but an off peak day return to Euston from Milton Keynes (a lot further than Royston!) is only about £12, I pay £10.50 or thereabouts with a Senior Railcard. A one-day travelcard (again using my Railcard) sat week was £14.50
Granted peak time travel is more expensive and "any service" (Virgin and London Midland) also comes in more expensive, but knowing the times of the off peak trains there and back I usually get by with the cheaper option by restricting my travel to one company. Parking within a 10 minute walk of the station is another matter and either £8 or £10 for the day depending on where.
I am lucky that I have rarely needed to buy a peak time ticket, but when I did a single plus an off peak return shaved a few pounds off the total.
GailJ you were ripped off
(National Express is certainly cheaper especially when there is free parking at the Coachway, as we have. But slow. )
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