FSA BB-7420ST Help

Hi,

I’ve got a 2013 Giant Defy 4 and after nearly 5000 miles, a creak is coming from the BB area, I’ve checked all the usual suspects, cleats, bolts on the chainring, crank arm bolts, removed the seat & post, creak/click still there on every pedal stroke. I am suspecting the BB is the issue here! There is also a little play when I move the crank from side to side.
It has an FSA BB-7420ST, Will the Shimano UN55 replace it? and what special tools do I need to do the job.. The noise is doing my swede in..

Any help or advice about something I’m missing here would be much appreciated.