I know a number of UK airlines have 3 or 4 criteria which seem to be: 4 or less retakes at ATPL, first series pass on CPL, first series pass on IR and an average atpl above a certain threshold airline dependant. However, as a group of guys finishing our training we worked out that they apear to take you to interview if you meet at least 3 of those criteria. And then its down to you.
Keep up the hard work and good luck.
**DISCLAIMER - This was true for us but may have changed / may be different for you..