Go back to CHC at Blackpool and have a word with the Basemanager I am sure he will assist you after all he himself is an avid aeroplane spotter. You should be able to see the aircraft on the pad between 1600hrs and 1800hrs.
They are a very friendly bunch and will assist you a I am sure just don't try it on Tuesdays and Wednesdays those are extremely busy days for them.