Sorry, didn't realize the HL plot was already posted (I have a slow dial up connection at work).
Just to be clear--I used the EIA crude + condensate production data for total North Sea (UK + Norway + smaller countries).   So, this puts the UK, Norway, et al, total remaining recoverable crude + condensate reserves at 17 Gb.   This suggests continued high decline rates.

The North Sea remains a fascinating case history for me because it peaked at exactly the same HL point as the Lower 48, 29 years later than the Lower 48.  As I have frequently pointed out, so much for better technology.  

You can compare the North Sea HL trend to the HL plots of Texas and the Lower 48 at:  http://graphoilogy.blogspot.com/2006/05/texas-and-us-lower-48-oil-production_25.html