Nasty cross wind on the way in but not as bitter as I thought it would be. Saw no one till coming out of Barking ,I got stuck at some lights and it ended up with 3 of us waiting for greens. I went on the road, then cut back onto the cycleway, they went on the cycleway so I got ahead. I did my usual charge up the mini hill before the A406/A13 roundabout but coming down the other side one of the other 2 cyclists on what I think was a white Moda pushed on and made it onto my back wheel . I thought he wanted to go past so pulled left so he could, also to give me the opportunity to blow my nose. No he would not go past so I pulled on the front for a while. After the next junction I again pulled left to let him go past, in the end he got the message and did his turn keeping it at around 19 mph in the strong wind. Looking at his calves he should have been pulling me along all the way. He tired after a while and I resumed on the front trying to keep it to a constant 19-20 mph. At the next junction we took different lines, I took to the road, he stayed on CS3 and I never saw him again. It had kept it interesting for a couple of miles and had helped us both, so win, win really.