Just looked now and mine shows in transit still, but there is Exception shown in the tracking detail. From UPS information, exception means:
"An exception occurs when a package or shipment encounters an unforeseen event, which could result in a change to the expected delivery day. Examples of exception include: address unknown, damage to shipment, or signature not received"
Hopefully it won't affect the delivery date, which when I check in My Orders on Apple's website, it is still showing estimated delivery 28 September. Hopefully it will update some time tomorrow with another update. I think last time, that there was another stop over before it finally reached the UK.
I am in same boat as you. Phoned ups earlier still saying 28th delivery so fingers crossed