From that dIagram it could be argued that most of the oil waters are in international water so the uk would still have as much right to the revenue as Scotland.
1. Send all Scots back home and make them apply for a visa and work permit to enter England
2. Bring all non Scot companies back to England like tax offices.
3. Withdraw anything that is funded by the UK goverment or taxes.
If they want to be independant let them really be so...