Creaky clucky noise coming from somewhere

[Blue Hills]

It takes a square taper, so the LBS is talking rubbish. You don't need the BB shall faced fit square taper cartridge.
!

Yes, yet another advantage of them.

 

[bikingdad90]

My Boardman has a square taper and had a creak like you described, turned out the BB was on too tight as it had been secured with an air gun