(I've seen your later post, but this is for visit 2)
Cambridge is less than an hour from London by train. From Cambridge, I can drive to the Uffington White Horse in 2-3 hours, with about an hour extra travel time to divert to the Rollrights on the way. From Uffington to Avebury is another hour or so, and from Avebury to Stonehenge about another hour.
Or skip it all and go directly to Stonehenge is 3-4 hours from Cambridge.
From Avebury/Stonehenge to Machynlleth is probably 4-5 hours driving.
From London-Orkney is about a day: leave London in the morning and arrive in Thurso in the evening and get the ferry the next morning. Or take the sleeper overnight to Inverness, and then 2-3 hours on the train to Thurso and then the ferry. Could be faster by plane.
no subject
Cambridge is less than an hour from London by train. From Cambridge, I can drive to the Uffington White Horse in 2-3 hours, with about an hour extra travel time to divert to the Rollrights on the way. From Uffington to Avebury is another hour or so, and from Avebury to Stonehenge about another hour.
Or skip it all and go directly to Stonehenge is 3-4 hours from Cambridge.
From Avebury/Stonehenge to Machynlleth is probably 4-5 hours driving.
From London-Orkney is about a day: leave London in the morning and arrive in Thurso in the evening and get the ferry the next morning. Or take the sleeper overnight to Inverness, and then 2-3 hours on the train to Thurso and then the ferry. Could be faster by plane.