Your credit file (Whcih you can apply for a copy for from Experian, Equifax and Call Credit) will show a series of numbers like this:
001100012322100
The zeros mean that you have paid on time, the 1s that you are one month in arrears, the two's two months in arrears etc.
Your file will therefore show:
1
So long as this sorts itself out, it will then show
1000000
If you applied for credit this month, then it may affect your rating, however, in 6 months time, it will have a negligible affect.