Travelinlite do pattern part bumpers, have a look at their website (prices listed), they come in primer.
You’ll need to drill the new bumper for parking sensors.
Maybe possible to transfer the old parking sensor brackets across to the new bumper with some new adhesive.
You might need to replace the bumper mounting bracket on the affected side, I think these are around 30-40 quid but Travelinlite can confirm.
New bumper reflector on the affected side, again Travelinlite can quote.
Re-spray of the bumper and possibly adjacent panels to get a blend, price depends on the bodyshop, but wouldn’t expect anything less than £400 for the paint, you’ll just have to compare quotes.