I would guess that it will be @ £600-£1000 labour at any garage and nearly as much on parts.
You should consider selling it and moving on unless you can't live without it.
I replaced the track rod ends on mine a few weeks ago, took it for a test drive and the steering was all over the place.
Did a bit of tracking adjustment and got it nigh on perfect without taking it to a garage.
I would first confirm what part they want you to find exactly if they'd be so kind, then find it on this site: https://www.parts-honda.uk by finding your model and year, might take a few trys.
Then look for the matching part on ebay