If I'm not mistaken you need a letter from your employer. If you have a UK EASA they should realise that you can get a licence though so not having the GCAA won't hurt your application. UK EASA is, in my opinion, worth much more than the GCAA anyway.
Wish I had one of those, GCAA not worth much outside the UAE at the moment. Lets hope that changes
Not holding my breath though