London Marathon Spectator Help!

[FlourPowa]

DP is running the marathon on Sunday. We aren’t from London but visit a few times a year so are confident on the underground. We have been trying to work out the best spectator spots and from what we’ve read Canary Wharf is a good spot. He is in the third wave to set off and is expecting to run it in just under 3 hours. We aren’t planning on 2 spots on the course then mile 25 (he is running for a charity and they have a designated cheering station so we are ok there)

My question is, how realistic is it going to be to get from Canary Wharf which I think is mile 18 & 19, to embankment to then walk to mile 25 (I know it’s not far but we’ll be fighting to get through the crowds). I’ve check city mapper and looks to be roughly 30 mins on the tube then walking to the cheer station but I know this will be a lot longer on the day. Although I was thinking that as he’s one of the earliest waves, there won’t be as much of a battle to get on the underground at that time….

Any help would be really appreciated, we don’t want to miss him at mile 25 at all but also don’t want to miss supporting him out on the course

Hi 2.40 is quick! I’ve been a spectator many times 3-3.30
If leaving from the start line at Greenwich, I’d take the DLR from Greenwich to South Quay dlr, which takes no time at all. This is about 17 miles in for the runners. It gradually gets busy, but nothing like Canary Wharf. I’d avoid CW , there’s issues crossing the road etc. At 2.40 hrs won’t be in a huge pack to spot at South Quay.

Then DLR to Bank -take tube central line -to Tottenham Court Road-
take
Northern Line to Charing Cross tube

This brings you out in the correct side of the cordon at Horseguard Parade, for the finish line and meet up point. Crossing the road from st James tube side is out of the question if you want to get there in good time
hope this helps