My mum has a dent in her rear bumper which looks like it could b pushed back the other way,So my question is can this be done or is a trip to the body shop.thanks for any info and advice

Replied to you in the General section mate.

If you gently and carefully heat up the bumper with a heat gun and push back out it should be ok.
Don't get the paint too hot though or it will blister and use something soft and round to avoid getting any high spots in the bumper.
Might take some time but you can get them as good as new

Replied in general chap.... :Suspiciou

I kno its in general, im trying 2 sort it out asap so i posted in both hoping some kind scoobynet member would be able to help me out!which they have.

Does anyone kno if ther is a removal and refitting guide for the the rear bumper?

Which car? Subaru? Year?

ok sorry i should of thought to leave the car model ........its on 03 sti

how to remove 05 sti rear bumper - ScoobyMods (http://www.scoobymods.com/forums/showthread.php?t=8391&highlight=bumper)
Hope this helps.
Think you will find they are mostly push in clips with bolts in the ends, but its been ages since I took one off.
This isn't probably 100% accurate but,
take out the rear lights, 10mm or 8mm nuts. remove all the clips you can see holding on the bumper (top edge, bottom edge, possibly corners)
Undo bolts in the corners which bolt up to the rear wings (10mm?)
Undo the bolts where the lights should be (10mm?)
A job for two people, as the sound of a bumper hitting the floor is a sorry sound :)
This may not be an exact guide but I hope it helps, if your near the midlands I could give you a hand??

one way of doing it , if its a plastic bumper would b to screw a screw into the very central point of the dent and pull it , then all u got is a tiny hole to deal with 3 mm or so depending on size of screw used.then rub hole flat with p800 then slap some filler in not bubble gum! flat the filler level and lightly touch up with correct spray leave it 2 weeks flat it with p1000 with some soap and warm water - t cut. jbs a good un!

If you gently and carefully heat up the bumper with a heat gun and push back out it should be ok.
Don't get the paint too hot though or it will blister and use something soft and round to avoid getting any high spots in the bumper.
Might take some time but you can get them as good as new

This is correct.
Plastic do remember their original moulded shape, so with some heat they will go back to their original shape.
That is all dependant on how bad the dent is though.
But well worth a try first.