Yorkshire Building Society Pass or Super Pass?

Hi all, can someone explain what the difference between a pass and a super pass is?

My situation:

FTB with 10% deposit. I completed a mortgage application with a mortgage advisor in Yorkshire Building Society branch. She took all my payslips, ID. Went through all my history. I was told I met the affordability criteria comfortably. The advisor then ran through a credit check and it came back as accepted. Great I thought...but then the advisor said she would need to get the decision upgraded to a super pass. She finished off the application by taking my solicitors details and vendors details. I was given a printed version of the application form and asked to read through it, sign it and post it back with a cheque for the application fee.

I am a little concerned as I assumed credit decisions were a simple accept, declined or reffered. Never heard of this super pass. Can anyone shed any light on this please? Really concerned as I do not want to start paying fees and getting my hopes up only to find out they are going to turn me down because I did not get this so called super pass decision.

Any advice, comments would be appreciated.

Terry