I used to commute on a CB400/4 from the outskirts of greater London (Uxbridge) into Camden Town (Chalk Farm Bus Garage) in the 1980’s because it only took 30 minutes but going on the train/bus would be at least 90 minutes or two hours on a bad day. Riding the bike was always a buzz and I didn't care how much it cost. In the late 90's and 2000’s I rode the CB250RSA to work in Earls Court and then to the job at Heathrow, what a hoot! I would arrive at work with a grin 😁 and feeling absolutely buzzing. It's not just the money factor to consider but the wellbeing feeling you get when riding a bike, I'd go for the wellbeing every time. As you said, you are dreading going back in the van. I sympathise, having to sit there in all the traffic and looking across at the person sitting alone in their car with only the drone of a radio for company when they could be having fun going to work on two wheels with an engine🙂.