"BD - are you able come up with some actual peer reviewed science that back up your claims that a solar downturn has caused the changes to the Arctic polar jet stream that we are now seeing."
Here is one such research paper published in 2010 . A combined effort by some UK , German and Korean researchers
Are cold winters in Europe associated with low solar activity?
M Lockwood1,2, R G Harrison1, T Woollings1 and S K Solanki3,4http://iopscience.iop.org/1748-9326/5/2/024001/fulltext/
quotes"We show that cold winter excursions from the hemispheric trend occur more commonly in the UK during low solar activity,
consistent with the solar influence on the occurrence of persistent blocking events in the eastern Atlantic. We stress that this is a regional and seasonal effect relating to European winters and not a global effect. ...
The observed increasing trend in the NAO between 1965 and 1995 may have contributed considerably to the warming trend in European regional temperatures (including CET) in winter  and solar modulation of the NAO has been suggested as a cause of the cold European winters experienced during the Maunder minimum
. Recent studies of solar influence on the phenomenon of jet stream `blocking'  are consistent with these ideas....
The current solar minimum has seen an unprecedented maximum in cosmic rays detected by high-latitude neutron monitors...
( My comment)Image shows an inverse relation between galactic cosmic index and and solar flux index
The results presented in section 4 allow rejection of the null hypothesis, and hence colder UK winters (relative to the longer-term trend) can therefore be associated with lower open solar flux (and hence with lower solar irradiance and higher cosmic ray flux)..
For example, enhanced cooling through an increase in maritime clouds may have resulted from the cosmic ray flux increase Alternatively, tropospheric jet streams have been shown to be sensitive to the solar forcing of stratospheric temperatures .
This could occur through disturbances to the stratospheric polar vortex  which can propagate downwards to affect the tropospheric jets, or through the effects of tropical stratospheric temperature changes on the refraction of tropospheric eddies ...
Interestingly, early instrumental records from the end of the 17th century indicate an increased frequency of easterly winds influencing the UK temperatures . This has also been deduced from indirect proxies [30, 31], including the spatial patterns of changes in recorded harvest dates . This suggests a link with the incidence of long-lived winter blocking events in the eastern Atlantic at low solar activity
These extensive and quasi-stationary anticyclones are characterized by a reversed meridional gradient of geopotential height and easterly winds [7, 33, 35]. Blocking episodes can persist for several weeks, leading to extended cold periods in winter as the mild maritime westerly winds are replaced by continental north-easterlies and the land surface cools under cloudless skies. In particular, long-lived Atlantic blocking events at more eastward locations have been found to be more prevalent at sunspot minimum than at higher solar activity,
an asymmetry that is enhanced by the phase of the quasi-biennial oscillation, and this leads to colder winters in Europe .
This evidence suggests that changes in the occurrence of blocking could be acting to amplify the solar-induced perturbations to the tropospheric jet stream .
Blocking events have been shown to modulate the stratosphere via upward propagating planetary wave disturbances, but the magnitude, extent and lag of the correlations over Europe strongly suggest that the perturbation to the stratospheric wind pattern can, in turn, influence the blocking . This feedback may be the mechanism by which solar-induced changes to the stratosphere influence European blocking events.Other evidence supports this idea.
For example, changed position and frequency of blocking events may be seen as a manifestation of modes of low-frequency circulation variability which have been found to respond to solar activity  giving increased/decreased frequencies of easterly/westerly circulation patterns over Europe under conditions of low solar activity
Lastly, one can invert the title of this paper and ask `Does the occurrence of lower/higher solar activity make a cold/warm winter in Europe more likely (than the climatological mean)?' Our results strongly suggest that it does, which has implications for seasonal predictions.