They cannot see it in the foreign bank account. But when you do the transfer from your Irish account they will see that you made a transfer. To avoid this you could withdraw in cash and lodge into a different Irish bank and then transfer it.
If you were trying to hide it from your current bank then you probably shouldn't have lodged it there in the first place.
No doubt when the new insolvency regime gets going the banks will be looking at people's accounts and where they are 'hiding money.' I'm not saying this is the case for you Jenny, but banks aren't stupid. They know if you withdraw an unusually large sum (say 5K) and put it into the post office, into prize bonds, into the credit union, into your UK bank account. I don't know what power in the future they will have to find these monies.