The actual difference between surface and upper winds varies by day, time of day and location. To really get the answer you can look at the forecast or actual tephigrams (soundings) at the URL below. Click on a sounding for e.g. Nottingham and on the right of the resulting graph is a set of arrows at each altitude showing wind strength and direction. There is also a graph in green showing the wind strength with altitude.
You will need to zoom in to see the detail. Put the mouse pointer over the tephigram and the mouse wheel will zoom the graph in/out. Hold the left mouse button down to move the graph around so you can see what you want.
The best approximation is my earlier post - daytime surface wind is 2/3rds upper wind and at night 1/3rd.
Have fun!
RASPtable