score:10
Yes. Or even, "Yes, yes and yes."
The National Rail Conditions of Carriage allow all these journeys. Season tickets are unrestricted (other than by route), so I haven't reproduced the conditions relating to restricted tickets.
Starting, breaking or ending a journey at intermediate stations
You may start, or break and resume, a journey (in either direction in the case of a return ticket) at any intermediate station, as long as the ticket you hold is valid for the trains you want to use. You may also end your journey (in either direction in the case of a return ticket) before the destination shown on the ticket.