How will axial precession affect the weather in the northern hemisphere (UK latitudes)?

Unless there's a twin star to our sun in which case axial precession might be an illusion the Earth's wobble won't effect the total amount of energy received from the sun as is expected from increased ellipticity, but will effect the amount of sun's energy to the Northern and Southern hemispheres in a cyclical 26000 (and diminishing) year period with periodic further exacerbations caused by variations in tilt.

How has Precession and variations in tilt been factored into the weather change model if at all?

As a side question: On the Salisbury Plain 6500 yrs ago according to wobble theory the East-West alignment going by the apparent motion of the sun across the sky must have been different to today. Can anyone tell me how to calculate the difference in respect to Grid North please?

Background:
I'm building a picture of Neolithic Britain and want to know the orientation of East-West in this time period to check for orientation practices if any. The particular time period I'm interested in lies about half way along the Axial Precession's swing so I'm interested to know A) Whether the axial precession exists or not and B) How the theory is in agreement with the weather patterns for the last 24000 yrs on Salisbury Plain.

• Instead of adding a comment you can edit your post to make it better. Comments may disappear. After that, delete your comment. Jan 1, 2016 at 12:48
• Axial precession doesn't change the amount of the north pole's tilt, just its direction. The sun still follows the same pattern across the sky, just at different times of the year (depending on how you define 'year').
– user967
Jan 8, 2016 at 16:36
• Re the side question : I think there is astronomy software available that allows you to calculate the positions of celestial objects at arbitrary dates. Some of this may be cheap or free, and may include axial precession - so if this is the case, you could just wind it back the right number of years and see where the sun is. Jan 9, 2016 at 8:53
• Simon W - Thanks. Stellarium is free and Starry Night Pro (Payware) has been recommended too. The sun is always East by definition. The affect of Precession means the plane of our tilt returns to a point in the direction of a sun's merridian 20 minutes per year earlier than a full cycle which means along with the extra day every four years added due to the additional quarter day in our yearly cycle we also have to add an extra day every 72 years. The question is do we really have a wobble since the planet doesn't apparently rotate about the x axis or are we in a vortex chasing the sun? Jan 10, 2016 at 10:30
• Barry Carter - Thanks.The planet rotates faster or slower than ideal, and, completes its cycle of the sun quicker than expcted. With no addition or subtraction to the tilt cause by precession along the y axis of the 'wobble' and no rotation about the x axis by definition (the sun is always in the east at the equinox) can it be truly called a wobble? Perhaps the sun has a wobble in its movement through space? The earth does nod and cause the tilt to increase and that must affect the weather over time. 6500 yrs ago everyone lived on hills cause valleys were too wet? Are we heading towards that? Jan 10, 2016 at 11:02