It would appear that the circumnavigation attempt – by bicycle – of Vin Cox has been certified by the Guinness Book of World Records as the fastest yet. The Guinness records site has not yet posted anything regarding this, so I’ve not been able to validate this directly from them. However, other third parties such as Road Cycling UK are also reporting confirmation of the time of 163 days, 6 hours and 58 minutes as the new fastest. This bests the previous record holder Mark Beauomont’s time of 194 days, 17 hours. Potentially of interest is the fact that both Vin Cox and Mark Beauomont are both from the UK.