Six wells at Whisby have historically produced approximately 1.0 MMbbl from a thin basal Carboniferous reservoir known as the Rough Rock or Basal Sandstone. The reservoir varies in thickness from approximately 0.8 to 4 metres and comprises high-quality sands capable of supporting production rates in excess of 100 bopd per well.

Current production of approximately 100 bopd is derived from W-4 and W-6, with reservoir support provided through the reinjection of produced water.

The planned re-entry and sidetrack of W-5, to be completed as W-7, is scheduled for Q3/Q4 2026 and is expected to add approximately 300 bopd of incremental production, with projected aggregate cash flow of more than £40 million over the following five years.