To be honest, I do not know the reasons the Co requested for more information. I think I took it easy at first as I thought it was going to be easy as the 489. At the end I tried to get things more organise such highlighting the salary transaction in my bank statement, and getting a stat declaration from my landlords instead of a simple statements. I added more invoices from GP and my studies as well as proof of residency.
Whatever I red from the forum here that found made sense to me I added up.
Only Cos know why they ask more questions.
Cheers