The outlook for the oil and gas markets has improved significantly after last week’s decision by Opec producers to reduce the global supply glut, but despite significant post-meeting price gains the supply-demand balance will not clarify for at least a few months.

An early signpost was due at the end of the week when an Opec team meets non-Opec producers led by Russia as part of a wider agreement last month to add 600,000 barrels per day to Opec’s own aggregate cuts of 1.2