Can you supply me with a good reference to Gordon Brown's abolition of
tax relief for North Sea oil exploration and its material impact on
the UK's known gas reserves?

Thanks!

Surely, you should be asking for tax avoidance devices 

- nobody in their right mind is going to realize 'local' resources
when they can use the same cash elsewhere - and not get raped.

Actually, it is quite sensible, the USA has been conserving 'gas' for
quite some time