The work was done by my local indy, but I'd decided that, as I want to keep the car for some time, I'd go with genuine replacement parts.
So this was a new steering rack, high-pressure pipe assy, low-pressure pipe assy, low-pressure PAS cooler.
Plus LDS ( lots as the system was nearly empty in the 1 mile trip to the garage) , laser tracking and of course labour.
Total cost was £2422, though £25 of this was for a new cabin pollen filter which was changed at the same time, while they were grovelling about in the footwell!
The rack is by far and away the most expensive item, coming in at £1370 including VAT.
Interestingly, the parts were virtually 'off the shelf' from Citroen which suggests that the steering rack issue is not uncommon.