I applied on July 15th, application was received on the 16th. The acknowledgement letter was dated July 25th, but not received until the following week.
My 'available' bank balance showed the payment was pending on the 25th which must have been the day they processed the debit in the Liverpool office, but didn't actually show as a specific 'line item' until July 28th.
Hope that helps! If all else fails, call your bank....and the UKVI.....