greenhalgh has seen many changes over the years and none for the better really. it is no longer a runs water as many of the fish have been removed as the owner wants to turn it into some sort of Blackpool gigantica! blanks are common now.
I fished it from when it first opened and when it turned into a match venue. the Tatics I witnessed where disgraceful, sea hooks with bait gripper spikes to hold paste on, hair rigged biro springs again to hold paste on. the fish were a mess, hardly any lips left on the poor things. fast forward a bit a the match scene died off, the fish recovered and grew. last time I fished it I had 165lbs in 4 hours, hair rigged pellet and pva mesh. that was when it was a runs water, that was 7 years ago.
I won't fish there again myself but a couple of mates do, they regularly blank. you can't night fish and only ONE may be used.
hope that helps