All,
Just called Giant Shark and had a very short conversation with them. Here's the summary:
1) Items that are shown as "Not in Stock" will almost certainly NEVER be stocked again.
2) They are reducing their stock "to save warehouse space".
3) The question about if they would sell a Taranis X9D Plus for 64 quid is mute as they will not be stocking them again!
Strange business plan...