If Cape Verde was going to happen this summer, then it would have been put on sale by now.
It will also most likely require night-stopping of crew in CV. I believe Tui only crew flights on both rotations if on the 787? 737 crew have to night stop. This would add complexity to the Jet2 flying program as they haven’t yet dipped their toes in such a regular operation.
I’m also not sure if the 737-800 has the legs for it? I believe Tui utilises the MAX?
Something for the 757/A321. Neither of which are based at STN. Not their own metal anyway.
As the a321 neo start to arrive giving better range then, just maybe, that is when Jet2 will start 'dipping their toes into such operations' with a long term plan for further expansion.