I'm not sure if that's a realistic commute. While the train from London to Coventry is only 1hr15 mins which is borderline but probably doable, it looks like it's another 20 mins bus from the Coventry train station to the uni (and with traffic that might be longer), plus however long it takes you to get from where you will live in London to London Euston. Also consider when does the bus leave relative to your train arriving? How often does the bus go? If you miss the bus, will you make your lecture/train/etc? What if there are strikes? Delays? Cancellations?
Commutes are very draining, even ones that don't seem too long, especially when you're doing it most days, and when you start daisy chaining different public transit services and having to balance all the different times and deal with different services having different possible disruptions. Commutes are also expensive (and you get less maintenance loan living at home), and you will inevitably end up with a situation of having one day where you have a single one hour lecture and are having to decide if you want to spend 2+ hours commuting for that or not. If you start skipping lectures because of your commute then things can get out of control very quickly. I really wouldn't recommend it for full time study.