reversed my ford ka into a low bollard couldnt see it through mirrors it has but a crease in boot floor pretty big is it repairable ??

If the boot floor has creased and the what looks like filler lumps have cracked then Unfortuantely it should be classed as a write off.

welcome to the club

Doesn't sound good news, but it could be unrepairable

The floor may be in need of replacing or pulling out with a jig.
The cost may be high though.