Sadly the road going to Box Hill starts at about 60m and reaches 210m in a short space of time, although we only have ourselves to blame. There were worried looks when we saw this sign.
However, when we got the top it was definitely worth it, with satisfying views and a road that could have been on Top Gear on the way down!
Things were going well until we went more off the beaten track and ended up in the middle of nowhere (somewhere around Mickleham). As we were hoping not to get a puncture this cycle Sod's Law dictated we would get a puncture just when we really didn't need it. Fortunately, we fixed the puncture and through process of elimination we eventually found our way back to civilisation.
By the end, me and Charles had also learnt what the bonk is, according to various websites eating more carbohydrates would have make our lives much easier. As 80 miles will be the longest we'll have to go, there will need to be some serious adaptations. But, that aside, we all made it back alive and with bikes relatively intact.
Here's some stats from my cycle computer:
Distance: 55.06m (some was added in the process of being lost)
Ride time: 5:58
Average: 9.2mph
Max: 25.7mph
Here is a link to our route on mapmyride.com