Brilliant! excellent idea. More of this please.
The pricing system in the UK has been bonkers for years. Going to London from Kent it was typically about 50p more for a return vs a single. Which is fine if your transport system is setup to handle the simple use case of a single bread winner going from home, to the office, and home again. But Say you wanted to goto London for lunch, then down to Brighton for dinner and a show, then back to Canterbury afterwards. The track layout supports this journey, but the cheapest tickets are a return to London, then a return from London to Brighton, making for a very long trip, or a very expensive trip.
Having everything as singles allows for trip chaining, which is something more often done by women. Take the kids to school, then goto the pharmacy to pick up a prescription, then onto grandma's to drop it off, then on to the office. Most UK public transport systems are really badly setup when it comes to trip chaining. Which is a shame if we a) want to get people to stop using cars and b) want a more equitable society.
The OV Chipkaart system in the Netherlands is brilliant for enabling trip chaining, I've done trips to do errands around the city where I've had a single trip chain last over 5 hours, and the OV chipkaart system to see it as a single journey.
With the UK moving to everything being a single, I think the next step is to also ban all advance fairs. So the only tickets are singles, that are the same cost when you buy on the day, or when you buy 3 months in advance. It will also stop rail companies replying to the the complaint that they are too expensive with "But we have tickets from just 5 quid!" sure you do, there's about 1 ticket for that price, available on a Tuesday at 1135, and only if you book it 9 months in advance.
UK train tickets need an overhaul. Moving to just singles is a great first step. Now make it uniform pricing across the country, and make it transparent.
J