Well, the IRCC was only recently introduced on 2 May 2019, so it is not possible to say with certainty how it will evolve. 

The first value for the IRCC, posted on 2 May, is indeed almost one percent lower than ROBOR, but the current trend is towards ROBOR.

If you're thinking of taking out a loan, you can calculate your monthly repayments online in the BT credit simulator and then find out over the phone if you're within the amount you want. 😊