Also as for the temp regarding the jet stream. Its roughly about 17* outside atm in the midlands at 1:57am in late DECEMBER.

The only time which it seems cold in my area nowadays is when the wind is blowing fairly fast from a northerly direction.

The wind then completely changes direction and it's feels warm again.

A few weeks ago there was frost on my car which you had to scrape off the windscreen (windshield). Now no frost or frozen roads for a few weeks.

Bottom line is the jetstream IS changing and will probably stop. If you deny this then thats you'r opinion but you cant deny the facts.