When can we expect the update ? UK Oil & Gas PLC (London AIM: UKOG) is pleased to announce that surface-based intervention operations at its 85.635% owned Horse Hill-1("HH-1") well have now has been completed. The well has now been shut in for a long term pressure build up test ("PBU"), designed to provide data necessary to understand whether the Portland reperforation programme has achieved the desired optimisation of well inflow performance.