Simwell acquired a 35% interest in Licence P2076, Block 113/27d in the East Irish Sea, awarded to Burgate Exploration and Production Ltd in the 27th Licensing Round and containing the undeveloped Castletown gas field.

In March 2018, whilst still in the "Promote" stage of the licence, Simwell and its partners exited the licence by transferring their interests in P2076 to Bridge Petroleum.  Subsequently the new owner of the licence decided to move forward into the second phase of the licence, undertaking to submit a plan of development for Castletown to the Oil & Gas Authority by December 2020.

Simwell  understands that, as the plan of development was not submitted, the license is now relinquished.