KBank App Sending Money From Thailand to UK

I recently sold one of my cars and am trying to send money from my KBank account back to the UK using the International Transfer option on the App.

System won't let me complete the transfer, apparently I cannot send remittance to myself. I managed to transfer funds back to the UK more than a year ago and don't remember having a problem before.

Anybody else encounter this problem? Is there a work around apart from sending funds to another family member back in the UK? 

Apart from Western Union & DEE Money are there any other options of sending money back the UK. 

Cheers...