I’m in Surrey Quays/ Rotherhithe as well. Takes me 5 minutes to BMM and about 30-40 to the Ace, depending on traffic etc… Total distance from my house to the Ace is 14.2 miles, by the fastest route… 
50 miles for me…but not the reason I rarely turn up, I dont have a night free only saturday and sometimes Thursdays so its only special days that I will get there, like kawasaki day recently…
sounds bout right but i must say there is only 1 way to go to the ace
It used to be a round trip of a mile, now it is 34.
11.6 miles, about 26 minutes (says Google maps). Riiiiight.