I hardly have the heart to do this in much detail - and maybe some fans won't be ready for such analysis - but this is an overview of how our beloved Merlin peeps built Avalon for the final episode. A few different locations were used, and different places within those locations, so it's certainly generated some confusion and discussion. This is how I think it worked, and of course any further ideas will be very welcome.
The very last scene in the very last episode of Merlin {sniff} was filmed in the road that runs past Huntsham Court Farm in the Wye Valley. It is a great choice for such an iconic scene.
This episode. Too epic. I cried, I laughed thrice, I loved, I cried some more. I loved it all so much. And I just couldn't even cope with doing a locations post before now. Sorry!