You can just see Starbucks on
this view from Streetview, it's directly ahead if you zoom in a bit (with the signs "...BUCKS COFFEE").
Typically in the past we've sat around a bit further North of that, looking out over the Thames, with the construction site which houses the slightly smoking remains of the Cutty Sark just behind us, but presumably they've found it necessary to block the area a bit more at the moment.
Can you still get to the tunnel entrance, or have they taken this opportunity to close that as well, and do some of the work on the lifts that they've been threatening to do for a while?
I'm up for this ride, although how far I get will depend on how badly my knees decide to start playing silly buggers. In the past I've generally just cycled across to Greenwich, it's probably less than an hour from Croydon.