Sounds fine, though I'd think about making the sessions more specific right now, rather than waiting till after Christmas.
I know it's always best to know what your goals are before embarking on a training plan, but, unless you're intending to race next season, I reckon these would help:
Session 1. Maybe 15 mins warm up, 20 mins in big chainring/ biggish gear holding as high a cadence as possible, 5 mins recovery, 20 mins in small chainring and PLF, 10 mins warm down. That kind of thing.
Session 2. 15 minutes of aerobic capacity stuff within the hour. 5x3 mins hard with 3 mins recovery between each effort. Or 6x2 and some 30/30secs sprints at the end to make up your 15 mins of harder effort; if 3 and 2 minute intervals are too hard to begin with, start with 1 min intervals/ 2 minute recovery and gradually work your way up.
Session 3. An hour of general pootling concentrating on technique. Keeping head and upper body still and just using the legs to provide the power for example.
If you're not racing, then you can afford to be a little flexible in your approach.