Mirrored the last ESB using Challenger in place of the Target but I suppose it comes down to individual tastes, I have always preferred Target for my bittering.
But turns out it is neither in the Holgate ESB, and no, there is no Galaxy in there. Met the head brewer today, take everything back about brewers being secretive, the brewer at Holgate couldn't be more helpful. Not only did he tell me that the bittering hops are either Super Pride or Ella, whichever is available at the time, preference in that order, and the remaining additions EKG he gave me 600 gram of each!