Reflecting on A2 resit in personal statement (medicine)

I'm currently on a gap year reapplying for medicine after receiving no offers last year, except I got AAB for my A2 exam results. I've already pinned down the universities (that'll take me with a resit) that I want to apply to, but Liverpool has specifically said to acknowledge and reflect on my need to resit in my personal statement. I don't have any extentuating circumstances as such, and was wondering if anyone had tips on how to do this - for example how much of the PS to dedicate to it, any general tips on how to sell myself despite it etc.
Thanks