We use ARAS cargo for legal documents and other paperwork that needs to be sent to Britain. ARAS links up with DHL in Britain and we've never had any problems.
Aras Kargo links up with DHL in Izmir. At least the one in Didim does.
Have used Aras/DHL both to and from the UK.
I did have a minor problem with the DHL site, as had to specify Soke for postcode 09270 as I could not specify Didim.
Package was delayed 24 hours (no big deal) as they tried to deliver in Soke although the Didim address was specified.
I used the Aras Kargo office for the outgoing package.