I did my PGDE in Aberdeen and it was only 2 days a week actually in uni because so many people commute such long distances. This was about 7 years ago, so it may have changed. At the time I really wasn't sure whether teaching was for me, so I sort of coasted my way through, so I wouldn't worry too much about the workload in the PGDE year.
Probation is where it gets a bit more tricky, but to be honest, as long as you are realistic with yourself and you are in a reasonable school you can do it within the 35 hours you are paid for. But then, I have to say that because I'm a union rep. 
Teaching in Scotland seems like it's way better than teaching in England. Whenever I get annoyed with things at my school I just read the TES Workplace Dilemma forum and think myself lucky that performance related pay doesn't exist here and that "Capability" isn't a thing.
I am secondary, but my sister is primary. I would say that the workload is similar but there is a much greater emphasis on planning in primary and marking in secondary.
It's a great job, but it is hard. I took a year out after I did my probation year to do something else and that brought into sharp relief how good a job teaching is.
If you have any more questions I'll be pleased to answer them (or ask my sister if they're primary focused ones).