My first “real” job was at IBM in Portsmouth in September 1984. Although I started using Portsmouth Direct services via Haslemere, I moved to Portchester and Fareham soon after. I often went Fareham-London either via Eastleigh or Southampton, the latter to use the non-stop service to London, but both with REP+TC.
Fareham-Southampton-London is not a “permitted route” today but this was before the Routeing Guide and always passed the “reasonable route” test. At the time the Weymouth services ran non-stop between London and Southampton.
I often travelled home on a Sunday evening, and my memory is of sitting at the front of a 4-REP+8-TC service, which was very quiet in the front coach. I could hear everything the driver could hear, bell and AWS.
I went on a SEG railtour which visited Dover Western Docks a little later.
The service to Winchester after Basingstoke always seemed fast, although it was pre-GPS.
The connection at Eastleigh for Fareham always worked, in both directions. I can’t remember ever being seriously delayed.