Your friend must be very unlucky. Only one Horsham - Peterborough train was cancelled today, and only one yesterday. That’s out of 78 services each weekday from Horley to Redhill.
Not really my experience I’m afraid. If I use the train for work, with the service as it is at the moment there’s three potential services within a half-hour window which I could use, two of which being Horsham/Peterborough and one being Cambridge/Brighton. It is very much the exception for all three to run, and this has been the case for as long as I can remember. Though, for the purposes of this thread, for balance it should be said that the Cambridge/Brighton is the less reliable.
And, of course, when something happens then it tends to be a complete meltdown, quite often with some considerable gaps to destinations, and often persisting very long after the original incident cleared. If something happens from early afternoon onwards then that’s it for the rest of the day IME.
Then there was a Saturday recently when we wanted to do a local walk, and we couldn’t even get one stop because of a gap in the service, and with the platform being packed we didn’t rate the chances of being able to board when a service did turn up. Journey duly abandoned.
To be fair things may have improved a bit in very recent times compared to the summer, however for me the damage is done - the combination of unreliability and the loss of the 365 services has got me used to using the car. It didn’t help that the one day I did decide to give the train a go I got caught up in the Hitchin signal failure the other week and didn’t get home until 0200. I can’t really see myself changing back to train being the default means, now it’s the exception.
In all honest things haven’t been dependable since May 18. In the case of weekends this has been the case for many years, certainly well into FCC days.