Hi Alex.
I now realise that, but you did state FL2 so that was the input for the photos, it has now been suggested that the regulator O-rings could be your problem, being a new purchase to you i would also do a leak back test on the injectors, maybe a fuel filter change which you will find behind the OS rear wheel arch liner.
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The HPFP regulator is best accessed if you remove the manifold, 20 minutes, and the starter but not really necessary, because with the manifold removed you can let the rabbit see the hole.
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Category > Bosch CP1 Common Rail Pump Spare Parts. This includes the following seals Examples of pump part numbers. International orders.
www.ebay.co.uk
Leak back test kit is about £25 from ebay etc.
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After 2 minutes tick over.
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With the manifold removed you can clean it out, and the EGR after removing the MAP sensor.
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Also if you do not know that it has been serviced in the last 12 months i would do that as well, oil, air PCV filters