I can't answer for your bank.   It is obvious that you are one of the posters who wants to blame paypal for everything.  Nothing I can say will convince you otherwise, but my experience is vastly different

I know that my bank does it's transaction runs overnight.....from 6pm onwards which is why I have to start the transfer before 5.30pm.

Almost all the bills etc that I pay with B-pay are processed overnight as are the bank transfers.