When did a Jet2 base look likely?
Nothing was ever confirmed. It's all speculation in that they've almost saturated their Northern markets and are expanding further south.
BOH stood out as the company first started at BOH and had some head office facilities until around 2005/2006. It also makes the most operational sense as they can't realistcally enter BRS/SOU and LGW, but can still capture a significant chunk of the southern market.
It would then only leave a couple extras in the likes of BRS/CWL/EXT/NQY and they'd have the whole country covered in some form