Oh! You couldnt get the full resolution image from Flickr?
Never mind. - I see that the OP lives in England, which is about as far away from New Zealand as it is possible to get while still staying on Earth. I am guessing that this trip may well be a once in a lifetime trip.
I have been in a similar situation. Back in late 2012 I went on a trip trip to my native South Africa for the first time in 18 years. I intended using my Olympus E-3 for most of my photos, but also bought a little Canon PowerShot S100 as a general purpose carry around camera. I took all my photos in raw and processed them them using Olympus Viewer for the Olympus and Bibble Pro for the Canon. I was generally happy with the results.
Then, a few months ago, I upgraded my raw file convertor to Capture One Pro Version 10 and decided to play with some of my old SA photos to give it a test. To say that I was impressed is a huge understatement! The highlight and shadow recovery work is amazing compared to earlier raw file convertors and the old Olympus E-3 wasn't exactly renowned for its dynamic range. I am now slowly, but surely reprocessing all the photos.
My point? - To the OP, I say: All photos are originally raw. If you have your camera set to write jpeg files, you are limited to the quality of the raw file convertor in the camera at the time you take the photo. Raw file convertors continue to improve. If you are going on the trip of a lifetime, you will probably want to reprocess the photos as newer and more capable raw file convertors become available. With jpeg files, you do not have this option. - And it is an option!
If it is a choice between raw and jpeg for a "trip of a lifetime", go raw. If you have space on your memory cards, use both raw and jpeg. That will give you the option to upload photos to social media while you are on the run, without the need to download and post-process the images.