Oh ok, you sent it via same-day service. It is not a standard type of transfer. They're using their partner banks directly for those transfers. All major banks in UAE have that kind of transfer option under different names: ENBD Direct Remit, Mashreq Quick Remit.The transfer was in EUR. ENBD does have a presence in London, ADCB doesn't. The transfer went to Barclays bank. But apparently this same day feature is listed on ADCB website under money transfers:
"Instant and same day** transfers for major currencies such as USD, GBP, EUR, CAD and INR"
I don't want to say UAE banks are great, as they are definitely lacking many things, but I sent bank transfers few times the other way around from different EU banks to UAE and it was never credited on the same day in the UAE.
They work with their partner banks depending on your destination to make transfers faster but they come with restrictions. You can't send more than a low 5 figure and if you want to send money to another person/broker you can face compliance problems. I sent 8k GBP to my US broker via Quick Remit and the US broker automatically rejected the payment because in the SWIFT message I'm not the original sender and the transfer description was lost.