Hi @SRA_WLS,
Yup, you use that online NVC inquiry form. In the message say where you case is currently (Abu Dabi it seems in your case) and where you would like to be transferred to (London) and why (say that there's a big backlog at Abu Dhabi), and why you think you're eligible (you have residence, are a citizen etc). At the bottom, you'll see there's a spot where you can upload files. Upload copies of your documents.
Hope that helps!