Hi, wellcome to the forum & good luck in your quest. I was in a similar position to you about a year ago. We applied for a visit visa & it was granted. Jen came over here last June for 6 months. She loved it here in London & we both really got on well. Like you, I wanted Jen & I to experiance living together before committing to mariage. We have since got married in pp & are awaiting a decision on our spouce visa ( & with 2 recent refusals on this forum I'm starting to get a bit nervous!!) As rayna said, try to show reasons why your gf would return home, ie job, family etc... Also we booked a holiday to hong kong before applying for visit visa which I'm sure helped. There's plenty of advise on here, just read up all you can & goodluck.