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My local cryptic has me totally stumped this week. I have a whole corner that I can't get. This one would give me a great help.

They provide the spirit of progress (6,5)
_ E _ R _ _ / _ U _ _ _

And I'm not even convinced that the "u" is right.

petrol pumps?

Trevor, you are a genius - and my saviour! Maybe now I will get some sleep - if I can finish it with the initial letters you have given me. Thanks a million.