Just an update on this for anyone looking to DIY. It's very easy (If you don't break the plastic snorkel!!)
I used the top fill method and simply replaced 4.7 litres with 4.7 litres. Sat the dsg oil in front of the radiator for an hour before filling and it only took around 15/20 mins for it all to go in.
I didn't bother overfilling then draining out the excess though so please do your own research before going ahead. My steps were;
1. Remove battery and tray (also removed cone part of ramair filter).
2. Remove DSG sump plug + drain overflow - 14mm Allen
3. Remove plastic snorkel + drain rest of oil - 8mm Allen
4. Refit plastic snorkel - 3nm
5. Refit sump plug - 45nm
6. Remove filter - 24mm Socket
7. Add in what i took out - 4.7 Litres using approx 10mm tubing
8. Refit Filter - 33nm
9. Refit battery
10. Run engine and using obdeleven waited for the dsg oil to get up to temp (between 35-45c) i then ran through the P, R, N, D, S for a couple of seconds each a couple of times. (Not sure if i really needed to do this using the 'measure and refill' method but i did anyway).