From what I hear, Atlantic are a little short on aircraft at present so Jet 2 / Titan are being subbed in to assist. I think Jet 2 finish at the end of March on the Stansted routes but Titan continue until late summer.
The ATP routes from JER/GCI/NCL to STN all end with the clock change in March. I think the channel islands will operate to EMA instead but no idea what the plan is for NCL. Maybe the closure rumour is correct - I have no idea.