Hello again
33 isn't too old! Although I went into this job straight after my PhD, plenty of people work in industry/academia for a few years before turning to a career as a patent attorney.
To answer your questions:
I'm 30 and I've been working for 5 years and just have one exam to resit until I'm qualified. However, due to expecting a baby shortly before the exam date, I won't sit that until Oct 2008 and then the results will be in April 2009, so I won't be fully qualified till then.
At most firms you work for a year, then do a course plus exams at Uni for 5 months (when I did it we only had lectures 10-1 each day and then I did two afternoons at work per week and the rest was study time, and you're paid your full salary), then do the 8 advanced exams over the course of the next 3-4 years at your own pace.
The advanced exams are difficult, you get some study days off work but you need to study evenings or weekends as well.
Yes, I work in London. Most private firms are based here, or else in traditional university cities e.g. Oxford, Cambridge, Bristol, Manchester etc. Big companies e.g. pharma, oil companies, defence, engineering etc. also have jobs in their patent departments and tend to be based where their research sites are. Whereabouts are you?