Just to throw another variable in, you can get a train from Great Bedwin or Hungerford. From Avebury you could take in the delight of the gravel road through the savernak forest to get to either.
I have hazy, fond, memories of Great Bedwin, I think we got told to piss off from Swindon once (too many bikes) and rolled to Pewsey on the point of collapse.. only to be told to piss off again! GB saved us in the end..
Just to throw another variable in, you can get a train from Great Bedwin or Hungerford. From Avebury you could take in the delight of the gravel road through the savernak forest to get to either.