Superhighway cycle to Big Ben

Using cycle lanes & quite ways we will cycle to Greenwich & use the foot tunnel to cross the Thames where the route continues along the Thames path till we reach SC3. This takes us along Cable St, past The Tower onto the Embankment till we reach Westminster. It's the same route back. It's a 30 mile round trip or you could choose to catch a train home from Charring Cross or Blackheath. The route is fairly flat with most hills on the way back. We should be back by 2.30 but this depends on the speed we cycle or any mishaps. Wrap up warmly, bring lights & a lock & money for refreshments/the train back or bring a flask & some sandwiches.