On the Island of Unst the airstrip was enlarged to support the Shetland Basin oilfield. There were no aids apart from an NDB on the coast 1 nm east of the runway.
The trick when it socked in with low cloud etc was to fly from the platforms descending to 200 ft approaching the coast. Homing on to the NDB carefully dodging around a couple of small islands brought you to the installation, sometimes at 50 ft/50 yds.
Continued flight was easy. You followed the excavator marks where they had laid the cable from the corner of the apron to the beacon.
You can still see it on Google Earth.