yea you should be able to sort this no problem.
I would imagine that the noise comes some time after the flush has been pulled, if so then the banging is loose pipes in the floor that will resinate around your home when the diafram in the cistern closes off the water supply.
Just need to lift floor boards and and secure pipes with clips and use a product hairfelt every time a pipe is cut through the top of the joist. One wrap of Hairfelt around the pipe will also help on heating pipes when you hear that tapping noise get faster.
Hope this helps
www.simplybuildbetter.co.uk
Joe S Dybowski
November 2010