Cylinder head refurb or tester close to derbyshire ?? Forge caps pic too

As title says, i think my BKD is suffering from porous head syndrome its losing coolant ever so slowly, headbis marked with the safe letter 'C'

Ive had egr cooler removed which was also leaking but unfortunately the coolant levels are still dropping slowly over time

My head is marked C so jm wondering ahs anyone else marked C had this happen ? And was it just gasket ?

****** car

Also got some forge caps and made the fit my TDI looks wicked IMO ?