I don't think Wideroe served Stansted previously maybe the odd flight now and again but never on a scheduled basis, there previous UK airports were Aberdeen and Newcastle.
There was I believe previously a short lived STN to KRS connection by a small Norwegian airline that only lasted a few months.
I hope that Wideroe do well with these new routes and hopefully they may expand further their flights from Norway not just from STN but elsewhere as in reopening NCL.