Because it has been very quiet at work this week, and because the Big Car (or at least the Car With The Big Boot) was here, I agreed to do so.
Time to get to outskirts of Reading (~J11 M4): about 75 minutes
Time to get across Reading to festival site (approx. 5 miles): about 150 minutes
Time to get home again from Reading: about 120 minutes (evening rush hour)
Look on caffeine_fairy's face when she realised all their stuff would fit in our car even with three people in it instead of two: rather gobsmacked
Friends' eternal gratitude and many karma points: priceless...