Hi

You can get your free credit file for the 1st month by checking Experian, Equifax and Call Credit. All 3 of the big agencys are offering 1st month free. It also does not affect your rating to check your own rating. There are also sites like checkmyfile that offer all 3 for £20 for 3 months but the experian report they show is not the full report so i suggest you check with all 3.

Dont keep applying, dont apply to often for lots of credit, register on the electoral roll - this is probably your biggest problem. You are probably not on the role and when they (credit card company) search your ratings they cant verify your address so probably reject you. If you are then on the role you are probably only showing for a short time so they might be concerned as you have no address history.

I would recoment waiting a few month beofre applying again and in the mean time check your reports and be sure you are on the electoral roll.

Cheers