Had a bit of an accident this morning where a car speeding through bumped me and knocked my number plate clean off with some bumper damage as attached. Is this repairable or would I be better off with a new bumper?

Is it going thru the insurance ,they will put a new bumper on i imagine,if not and you are paying for it a good local body shop will repair that for you 👍

If it's just a few scratches and that little hole I'd see if a local "chips away" sort of person could sort that.

You could go diy to take the scratches out and disguise or repair the hole if you're worried about it, I'd leave it until selling the car as you could get further damage there after this repair.

A couple of number plate screws will sort the number plate.

(Or - thin out the white tac and it could hold the number plate on for years (I had plastic parts held by blue Tac for years inside and outside the car, car outside through at least two winters. Blue or white tac can make a very strong bond.)

It could be very expensive to go through your insurance, even if you have protected No Claims Bonus, you'll lose your Excess and next insurance and following years renewal premium will increase because of the claim which all added together could be a lot of money - for a very small bit of cosmetic damage (assuming nothing else has been damaged or affected).