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If the moisture is on the glass, that’s a good thing as it’s not anywhere else in the watch. This often happens at this time of year, especially with the combination of a warm wrist from cycling and cold air. It doesn’t necessarily mean it’s leaking, but it is worth taking the watch for pressure testing, especially if it is under warranty.
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It does sound like there’s been some water ingress and the seal is compromised. A couple of large bags of silica gel with just the watch head, crown out, face down in a ziplock bag for a week or two will get the components dry. Otherwise take the caseback off and leave it in a warm dry place for a few days. Take care, “warm and dry” is not good for leather.
Perhaps the caseback seal was mis-seated or damaged if the previous owner opened it up or the crown seal was somehow compromised. This is relatively unlikely to be a manufacturing fault IMO.
I'm a bit freaked. Cycled to work through some medium - heavy rain and when I got in to office found what seemed to be fine dirt underneath crystal - actually really fine beads of condensation. It was a little worse than the picture below. I took it off and left it sitting on my desk for around two hours at which point it had almost fully disappeared. I put it back on and it started to fog back up again at which point I took the picture below.
Have read five or six different opinions as to what to do - would love if anyone here from experience could weigh in - should I get on to Hamilton?