Scruffmonster, I cycle from various parts of that area to ride into London Bridge, depending on how I feeling on the day. Usually, along the A20 - Lee High St into Lewisham then New Cross and Old Kent Rd. The junction where Lee Fire station is going towards Lewisham you need to watch out for the 2 lanes that try to fit into 1 lane at the other side of the lights and don't give you room. The large roundabout at Lewisham DLR station, watch out for the cars coming from Catford rd. Usually busy there and cars just pull out from all directions. At the top of Lewisham way, watch out for cars turning left at the junction before the traffic lights. Seen 2 people knocked off their bikes when the car turns left quickly to miss the traffic jam at the lights. There are currently roadworks at the bottom of the hill by New Cross bus station which causes alot of traffic. After that, just need to watch for the taxis as you can use the bus lanes most of the way from here. Also, don't forget that the motorbikes can now use the bus lanes as well. From here I go down the Old Kent Rd to Tower Bridge Rd. This is also a traffic hotspot. Why the drivers think this is a 2 lane road when it clearly isn't. This doesn't leave any room on road so you'll end up on the wrong side of the road. On the way back to lewisham, just need to watch out for the junction on the Old Kent Rd where PC World is. Watch out for the lorries turning left there. Also when you get to the bottom of Lewisham Way going into Lewisham, watch out for the traffic turning right across the traffic. It's usually busy so they will be coming across through the traffic. Lewisham roundabout will always be busy. Sorry is it's a long post, but hope it helps. I do about 11 miles each way usually from Bexley on a MTB so I don't think it will be too much of a problem. Get road tyres instead of the knobblies if so haven't already done so. What time of day will you be making this journey?.