I agreed to change the whole front lower wishbones, because although the part is more expensive it makes the labour cheaper, and ultimately is a more thorough job. Each wishbone was £44 each.
He also did the rear bushes without removing the subframe. No idea how, but the whole job front and rear only took 3 hrs.
The total price including parts, labour and VAT was £232 which around 1/3 the price Ford wanted. There may be a bit of "mates rates" in that, but I am a happy bunny indeed.
The car feels so much better now, and the constant jitter over small bumps has gone completely. I was also getting a squeak from the front-left over bumps, and that's gone too. The whole ride and steering have been improved massively.
Tomorrow I'm taking the car for 4-wheel laser alignment, so everything should be sorted.