Do I have any recourse against Jaguar Land Rover for the EGR failure in my 2013 Evoque?

My 2013 Range Rover Evoque was in for a service a month ago. During the service they reported that there was a coolant leak. This was confirmed to be coming from the EGR cooler and this will require both the EGR and cooler replacing at a cost of £925. I have researched the issue on the internet and note that a significant number of JLR customers have reported issues across the range with EGR failures. I wrote to JLR to complain that this was a widespread issue and was surprised that this was not being covered on a recall. They have eventually responded and after going back and forth they have offered a gesture of goodwill of 50 per cent towards the cost as my vehicle was four years old and now out of warranty. My response was that this was a fault in manufacture and I shouldn't be having to pay for something that is clearly not a one off fail. They said they would review it again but have just come back with the same offer. A concern is that I could be looking at a similar bill in a few years time when the new parts fail again. Do I have any other course of action?
This is a PSA/Ford engine, not a JLR engine, and I have not seen a massive number of other complaints over other vehicles fitted with it. One previous report in the Evoque suggests that the problem may be the way it is installed in the car: www.honestjohn.co.uk/carbycar/land-rover/range-rov.../ Only one report of an EGR failure in the Freelander II with the same engine: www.honestjohn.co.uk/carbycar/land-rover/freelande.../ None reported in Discovery Sport, Outlander, 4007 or C Crosser with the same engine.
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