Hi Lulu,
You can ask for a repayment holiday for upto 3 months, but there is no guarantee they will provide one, and during this time the interest on the loan is added on and you will end up paying more.
You might have to provide a reason for the holiday other than you are struggling as this will likely worry them. Perhaps that you are looking to pay for an actual holiday?
If the payment holiday is agreed it won't be recorded as a late payment on your record, but I'm not sure how it will be displayed.
HTH
Sparky.