I sent my passport and a receipt for utility bills. bank statement within 90 days from the confirmation of my salary for 3 months. My salary is 1700 pounds. The loan was needed in the amount of 0.7 BTC for a period of 30 days. This loan is not difficult for me to pay.
1700 pounds to be honest isn't that high of an amount for an average wage... However, the loan that you're trying to take out seem to be only around 25% of your monthly salary earned.
Have you tried with a lower amount? I mean, BTCJam is pretty legit AFAIK.
https://www.dropbox.com/s/9uj06f82nh8ucc6/Screenshot_4.png?dl=0