Thanks, but the leak has disappeared.
Also have corrected the electrical issue.
Seems that after the alternator was replaced, the radio started cutting out while driving, sometimes it wouldn't start and sometimes the starter was really stuttering or there was absolutely NO POWER AT ALL, no chime, no gauge lights, nothing, completely dead.
Wiggling the positive cable would restore power, so I jacked the car up, got underneath and checked the cable on the starter: Nut was completely loose. Tightened it up and problem went away.
All good now
Thank you to everybody that provided help and tips and hints, especially FieroFool, ThaDriver & Aerodonamic.
\D