If after due diligence you come to the conclusion that the meter head and/or the regulator need refurbishment then £600 seems very reasonable to me. The warm up reg is quite simple in operation and readily reparable but meter heads are very very difficult indeed. When I worked on quattros I did do lots of them but I'm not to proud to admit that the first few were a complete disaster. The key thing is a need to be scrupulously clean-as in operating theatre/medically clean, the tiniest speck of dirt between mating surfaces and it will leak. Essentially you have metal to metal surfaces ( some that move)that have to seal fuel at several bar of pressure, they are incredibly finely machined.
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