This port is quite good actually. It's a bit raisiny, but it's also complex and powerful. My friend who I was drinking it with remarked that it tasted different every time he took a sip - a good indicator of a wine's complexity. Like I said I'm not that experienced with vintage port, but I found this impressive, unlike 'normal' port or LBV, which I usually find underwhelming.
I reckon it's still quite young - it has a youthful acid core. Maybe another 10 years?
Also - apologies for not identifying the producer, I left the bottle at a friend's house. Will update with more info soon.
UPDATE: This port is what used to be called Martinez Quinta Da Eira Velha Vintage port. Martinez was acquired by Symington in 2006.
Taste the Difference Vintage Port 2000