Bente,
I can not prove who did the bank job (obviously) and never said I could.
I did point out that the governments, police and security services of both Britain and Ireland said that they did.
I also noted that a Republican in the South was found to have bank notes to the value of $ 3 Million US in a bin in his back yard.
Not proof but...
Another Republican tried to burn so many banknotes that clouds of them emerged from his chimney and covered the neighbourhood with singed money.

The bar killing would be the McCartney murder. The IRA admitted that their members did it and offered to shoot them.

I forget now what became of the Columbian suspects.
They did stand trial.
They said that they were in the terrorist controlled area to do some bird watching and not to train them in explosive techniques.
It was coincidence that they started using far more sophisticated bombs then, against ordinary people in the street.

Keith.