[werk_ag]

Ok thanks for the explanation Werk. Does VP2_WIND_RESOLUTION apply to both 'Wind' and 'Gust' or is it just the 'Gust'? 

I could perhaps use the StdCalibrate feature but I'm not sure if it would work or provide any benefit

http://www.weewx.com/docs/usersguide.htm#StdCalibrate

Aplies to both, but perhaps you only need to set in one statement, probably wind. Check Weewx documentation
Yes, it seems that is in the StdCalibrate section.
Should be something like: wind = wind * 0.448 for VP2_WIND_RESOLUTION 2