I've looked at commuting by train but not a viable option, especially for the early starts (even worse at weekends) as it would involve a change at Southampton every trip each way.
Easily adds around 4 hours travel time to every working day and thats if they're reliable (which they are not)
Car sharing and donating towards petrol will often work, but not guaranteed.
I wonder if it would be cheaper to book an intensive driving course and buy a car (capable of making the 80 mile round trip every shift) or renting nearby and buying a bicycle?