Thread update. I did email Peugeot about this and asked the question. I was getting the impression they were willing to make some contribution, but they weren't clear about how they would help.
What they did ask was it was taken to a Peugeot dealer for investigation. I'm 50 minutes away from a Peugeot dealer. A couple of visits for investigation and repair was going to be a pain. By the time I organise travel back home it's a bit of effort and time consuming.
Peugeot are asking £650 for a new pump, but they are also offering refurbished units for £540.
I then spoke to a guy on eBay who refurbishes the pumps. It's less than £150 to refurbish your HPFP or a premium for an off the shelf unit.
It's been in the car a couple of days now and all seems good. It looks like a good alternative to a big bill.
